Dishwasher 2

8/8/2019 Dishwasher 2

1/32

STUDY COURSE

UNDERSTANDING DISHWASHER:

ELECTRICAL COMPONENTS and

CHECKING PROCEDURES

Module 2LIT 4314190 Rev. A

DISHWASHER and COMPACTORDISHWASHER and COMPACTOR


2/32

All right s reser ved. No port ion of th is book may be reproduced in an y form with out

written permission from WHIRLPOOL CORPORATION.

1990, 1998 WHIRLPOOL CORPORATION

WHIRLPOOL CORPORATION does not assu me an y responsibilityor an y liability in conn ection with th e use of this m an ua l.

The trademar ks WHIRLPOOL , , , andFSP ar e registeredtrademarks of Whirlpool Corporation.


3/32

INTRODUCTION

The mat erial presented in th is module is inten ded to provide you with an un dersta nding of the

fundam enta ls of dishwasher an d tra sh m ash er compactor servicing.

Major a ppliances have become more sophisticated, takin g them out of th e screwdriver a nd pliers

category. Their electrical circuits include several different types of automatic controls, switches,

heaters, valves, etc. . Semiconductors, solid-state controls, and other components usually

associated with radio and television electronic circuits are being engineered into automatic

washer s, dryers, dishwash ers, and refrigerat ors.

The appliance technician is emerging into a professional status of his own. He must prepare

himself now to be able to perform his dut ies today as well as to reta in his pr ofessiona lism in th e

future.

No longer is on-th e-job tr ain ing sufficient to prepa re t echnicians for t he complicated pr ocedu res

required for t odays sophisticated applian ces. This tra ining can best be obtained th rough organized

classroom study and application. However, much of the knowledge necessary to service todays

appliances can be obtained through study courses. Completion of this and other courses will

provide you with su fficient un dersta nding of applian ces a nd t heir operat ion t o enable you to do

minor service. It will also serve as a valuable stepping stone to more adva nced study a nd on-the-

job tra ining t o impr ove your servicing skills.

Informa tion contained in t his module is used on WHIRLPOOL appliances. It is separat ed into

two sections for your convenience. Chapter 1 covers porcelain liner models (1986 and older), and

Chapt er 2 covers plast ic liner m odels (1986 an d n ewer).

1


4/32

CHAP TER 1 ......................................................................................... 3ELECTRICAL COMPONENTS for P orce lian Liner Mode ls-1986 and Older.

CHAP TER 2 ....................................................................................... 2 1ELECTRICAL COMPONENTS for Plas tic Line r Models-1986 and Ne w er.

*TEST ......................................................Se e Te st Book LIT4314204

*N O T E: We recom m en d t a k i n g t h e TES T for MOD U LE 2, r i g h t

a fter s tud ying i t .

PAGE

TABLE of CONTEN TS

2


5/32

CHAPTER 1

ELECTRICAL COMP ONENTS

(for P orce lain Lin er Mod els : 1986 and Olde r)

*TIMER

*DELAY TIMER

*RAPID ADVANCE TIMER

AREATIMER

MOTOR

DOOR

SWITCH

ROCKER

SWITCH

(HEAT/AIR)

START

RELAY

PUSHBUTTON

SWITCH

RINSE

CONDITIONER

DISPENSER

PRESSURE

SWITCH

THERMOSTAT

RAPID ADVANCE

TIMER AREA

DETERGENT

DISPENSER

ACTUATOR

WATER INLET

VALVE

MOTOR

HEATER

3


6/32

TIMER

The timer is located in th e console and is th e hear t

of the dishwasher . Its function is t o control the t im-

ing of the dishwash er.

All timers used on dishwashers operate the same

but are somewhat different in looks. Due to func-

tions or features of different models, some timers

have more terminals and internal switches (con-

tacts) tha n others.

The dash line represents t he actual t imer where as

th e bold lines indicate inter na l switches within th e

timer.

On quick-disconnect timers, the different colored

harness wires are placed inside either a black or

white block which plugs into the timer. These

blocks are colored to match the words BLACK or

WHITE stamped on the timer. The possibility of

wiring the timer wrong is great ly reduced.

CHECKING PROCEDURE

Obtain an ohmmeter from your local st ore. We will

be doing RESISTANCE checks. This is the safest

way because the dishwasher is unplugged from the

power source an d a voids th e possibility of receiving

an electrical shock.

S te p 1 Set th e ohm meter scale to the lowest ohms

setting and ZERO the meter.

Step2 See example in st eps 7-10. Turn th e timer

kn ob to th e point in th e cycle you su spect is bad.

Step3 Remove both the white and black discon-

nect blocks. Some m odels only h ave t he (black) dis-

connect block. The blocks have tabs on each end

which m ust be pressed wh ile pulling on th e block.

Instea d of coding timer t ermina ls like the sta nda rdfra me t imers, a char t of each wiring block is pr inted

on t he back of the t imer. The line th rough th e cha rt

separates the two blocks. Letters indicate active

term inals while the black dots ident ify blan k ter mi-

nals.

Step4 Touch an d hold one ohmmet er probe to the

ter min al specified for th is fun ction.

Step5 Touch the other ohmmeter probe to the

other terminal specified for this function.

Step6 The ohmmeter should show ZERO resis-tan ce (contin uity). If not, th e timer is bad a nd n eeds

replacing.

BK G W

T T BK

CABINET GROUNDDOOR SW.

DELAY/HEAT LIGHT

W-T

W-BKT-R T-R

P.P. SW.

8

29

22

W-BK

W-BKW-BK

T-RN.O.

THERMOSTAT

28

31 33

39

12

19

6

11DET. DISP.

O-BK W-RO-BK

W-R

W-R

T-R

W-TW-YW-Y

R

OR

R

OR

W-G

P-BK

W-G

P-BKF

D

K

H

C

E

W-V

DELAY

START

LIGHT

LBU

BR

GY

Y

V

BU BU

TIMERMOTOR START

RELAY

WET AGENT BR

V

BU-V

LBU W-R4

5

1

2

3

BR-W

OVERFILL SW.

W-BK

PUSBUTTON

4


7/32

Step7 EXAMPLE: Move the timer to the start

of NORMAL wash. PROBLEM: Dishwasher does

not fill.


terminal T.


terminal BR.

Step10 The ohmmeter should show ZERO resis-

ta nce (continuity). If not, th e timer is bad a nd n eeds

replacing.

Step11 If the door switch is good but the dish-

washer still wont sta rt wh en th e timer kn ob is

pulled out, check the internal timer push/pull

switch (P.P.SW.) conta cts.

Step12 Pull the timer knob out.

Step13 Touch and hold one ohmmeter probe to

the terminal T.


term inal W-BK.


ta nce (continu ity) with t he t imer kn ob pulled out. If

not, the timer is bad a nd n eeds replacing.

The ohmmeter should show an open circuit with t he

timer kn ob push ed in.

Step16 Place the colored blocks in their proper

end ma rked BLACK or WHITE on th e timer.

RAP ID ADVANCE TIMER

This part, used with a pushbutton switch, has no

dial or knob to turn. As the pushbutton switch is

pressed for the cycle you want, the rapid advance

timer motor quickly advances the timer to the

proper start-up cycle. At this point, the regular

timer m otor ta kes over.

There are two areas in which this rapid advance

timer could be located: either behind the access

panel/toeplate (Built-In Models), behind the access

panel/coverplate (Portable Models), or in the con-

sole ar ea for both types of dishwasher s.

CHECKING PROCEDURE

Obtain an ohmmeter from your local store. We will


way becau se the dishwash er is unplugged from the

power source an d avoids th e possibility of receiving

an electr ical sh ock.

Step1 Set th e ohmmeter scale to the lowest ohms


Step2 Disconnect any timer motor wires, mark-

ing them a s to where they were.

Step3 Remove both the white and black discon-

nect blocks. Some m odels only h ave t he (black) dis-

connect block. The blocks have tabs on each end

which m ust be pressed wh ile pulling on th e block.

Instea d of coding timer t ermina ls like the sta nda rd

fra me ra pid advan ce timers, a char t of each wiring

block is printed on the back of the timer. The line

through the chart separates the two blocks. Letters

indicat e active termina ls while the black dots iden-

tify blan k term inals.

Step4 See example in steps 8-11. Using a screw-

driver, place it in t he slot on t he sh aft of the rap id

advan ce timer and tu rn it to the cycle you suspect is

bad.


ter min al specified for th is fun ction.


other terminal specified for this function.

STEP7 The ohmmeter should show ZERO resis-

tan ce (contin uity). If not, th e timer is bad a nd n eeds

replacing.

T

P.P. SW.

8

22

28

P.P. SW.

T T

8

BKG W

CABINET GROUND

BK

W-BK

P-BK

T-RW-BK

KNOB PULLED OUT

(CONTINUITY)

KNOB PUSHED IN

(NO CONTINUITY)

DOOR SW.

5


8/32



not fill.


terminal T.


terminal BR.


ta nce (cont inuity). If not, the r apid a dvance timer is

bad an d needs replacing.

Step12 If you know the door switch is good but

th e dishwasher st ill wont sta rt, check th e intern al

timer push /pull switch (P.P.SW.) which ar e conta cts(T to W-BK).

Remember: There is no push/pull switch although

th e timer contacts ar e th ere. Also, since th ere is no

timer shaft for a dial and knob, a square hole has

been provided in the cam shaft to use for rotating

th e timer t hr ough its cycles.

The timer cycles are printed on th e timer plus th ere

is a raised step on th e cam sh aft that is a pointer to

indicate where t he t imer is in t he cycle.


the terminal T.


term inal W-BK.


tance (continuity) with the rapid advance timer in

th e ON position. If not, th e timer is ba d an d needs

replacing.

The ohmmeter should show an open circuit with th e

rap id advan ce timer in the OFF position.

STEP16 Replace th e colored blocks in th e pr operend ma rked BLACK or WHITE on th e timer.

STEP17 Replace th e timer motor wires.

BK G W

BK

DOOR SW.

CABINET GROUND

T

W-O W-G

T

T

W-O

W-O

W-G

W-G

W-T

W-P

W-Y

BR-Y

W-T

W-P

W-Y

GY-GGY-G

GY-P

GY-P

DELAY TIMER DELAY LIGHT

CLEAN LIGHT

TIMER

26

23

27

15

Z

X

Y

P

W-R

W-R

BR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

W

R-YR-Y

5

6

4

11

22

7

3

TIMERMOTOR START

RELAY

TIMER

S.I.S. V V

BU BU-WBU

Y

GY

2

1

W-Y

17

34

25

24

28

13

W-BU

W-BR

W-BK

BU-R

P-BK

W-BU

W-BU

W-BR

W-BR

W-BK

W-BK

W-BK

GY-P

GY-P

GY-PBU-R

P-BK

P-BK W-BK

T-R

DELAY/HEAT

PUSHBUTTON

T-R

W-BK

W-BK

Q

R

S

M

N

B

D

C

TIMER

6


9/32

DE LAY TIMER

This part is located in the console. Its purpose,

when selected, is to delay the start-up of the dish-

washer u p to eight h ours.

CHECKING PROCEDURE

Obtain an ohmmeter from your local st ore. We willbe doing RESISTANCE checks. This is the safest




Step1 Remove one wire a t a t ime, car efully label-

ing each wire a ccording to the t ermina l mar king on

the delay timer. This procedure should assure that

th e right wire is reconn ected to the right t ermina l.

Step2 Set th e ohmm eter scale to the lowest ohms



terminal T.


term inal W-O.


ta nce (contin uity). If not, th e delay timer is bad a nd

needs r eplacing.


term inal W-G.

Step7 Touch the other ohmmeter probe to theterm inal W-O.

Step8 The ohmmeter should show an open

circuit. If not, the delay timer is bad and needs

replacing.


term inal W-G.


terminal T.



replacing.

Step12 Rotate the delay timer dial so that a

TIME is shown on t he dial.


the terminal T.


term inal W-G.


tan ce (cont inuity). If not, the delay timer is bad a nd

needs r eplacing.


the t ermina l W-O.


term inal W-G.



replacing.


the t ermina l W-O.


terminal T.



replacing.

Step22 Reconnect all the wires to the proper

term inals as previously mark ed.

BKG

W

W

W

BK

DOOR SW.CABINET GROUND

T

W-O W-G

T

T

W-O

W-O

W-G

W-G

W-G

W

W

BR-Y

W-T

W-P

W-Y

BR-Y

W-T

W-P

W-Y

GY-P

GY-G

TM-W

GY-G

GY-P

GY-P

DELAY TIMERDELAY MOTOR

DELAY LIGHT

RINSE/DRY

CLEAN LIGHT

TIMER

R.A. TIMER

MOTOR

26

23

27

15

Z

X

Y

P

16

7


10/32

TIMER MOTOR

Timer motors may var y slightly in appear an ce, but

regardless of the differences each functions in the

same manner as the others. It is a synchronous-

type motor, similar to those used in electrical

clocks, with a sma ll pinion wh ich dr ives a gear . This

par t is located on th e timer assem bly an d is used toadvan ce th e timer th rough th e cycles.

CHECKING PROCEDURE






Step1 Disconnect the two wires coming from the

motor, marking them as to what terminals they

were on. This procedure should assure that the

right wire is reconn ected to the r ight term inal afterchecking or r eplacement .

OR

Pu ll apa rt t he two connectors.

Step2 Refer to the instructions that came with

your ohmmeter to find th e proper scale to measur e

1,500 to 3,000 ohm s. Set t he ohms scale and ZERO

the meter.

Step3 Touch an d hold one ohmm eter pr obe to one

of th e timer m otor wire term inals.


other timer m otor wire termina l.

Step5 The ohmmeter should show a reading

between 1,500 to 3,000 ohms on the ohms scale. If

not, the timer m otor is bad an d needs replacing.

STEP6 Reconnect all the wires to the proper

term inals as previously marked.

NOTE: If you get this reading, the timer motor

could still be bad from a mechanical problem inside

the motor. This condition can only be checked byru nn ing a volta ge check.

T

BK G W

W

T T BK


CLEAN LIGHT

TIMER MOTOR

DELAY/HEAT LIGHT

W-T

W-BKT-R T-R

W-T

W-BK

W-BK W-BK

THERMOSTAT

N.O.T-R

P-BK

W-G

T-RP-BK

W-GK

D

F

33

8


11/32

DOOR SWITCH

The purpose of the single-pole, double-throw door

switch is to stop the dishwasher when the door is

opened. A bad door switch could cause the dish-

washer to keep run ning with th e door open or not to

ru n with th e door closed.

CHECKING PROCEDURE








th e door switch. This procedur e should assur e tha t

the right wire is reconnected to the right terminal

after checking or r eplacement .



Step3 With t he door closed, touch a nd h old one of

the ohmm eter pr obes to one of the t ermina ls.


other terminal.


ta nce (cont inu ity). If not, th e door switch is bad a nd

needs r eplacing.

Step6 With th e door open, touch an d hold one of

the ohmm eter pr obes to one of the t ermina ls.


other terminal.


circuit. If not, the door switch is bad and needs

replacing.



T

BK G W

W

T T BK


CLEAN LIGHT

TIMER MOTOR

DELAY/HEAT LIGHT

W-T

W-BKT-R T-R

W-T

P.P. SW.

8

29

22

9


12/32

ROCKER SWITCH

This part is located in the console and is used to

select the type of drying you prefer. Either the en-

ergy sa ving AIR DRY or H EAT DRY.

CHECKING PROCEDURE

Obtain an ohmmeter from your local st ore. We willbe doing RESISTANCE checks. This is the safest






the rocker switch. This procedure should assure

th at t he right wire is reconnected to th e right term i-

na l after checking or replacement.



Step3 Move the rocker switch to the AIR DRY

setting.

TWO TERMINAL SWITCH


of th e termina ls.


other terminal.


circuit. If not, the rocker switch is bad and needsreplacing.

THREE TERMINAL SWITCH

This closes cont act "B"


term inal R-W.


term inal BU-OR.


tance (continuity). If not, the rocker switch is bad

an d needs replacing.

Step10 Move the rocker switch to the HEAT

DRY setting.

TWO TERMINAL SWITCH


one of the term inals.


other terminal.

Step13 The ohmmeter should show ZERO resis-tance (continuity). If not, the rocker switch is bad

an d needs replacing.

THREE TERMINAL SWITCH

This closes contact "A"


the t ermina l R-W.


terminal OR.


tance (continuity). If not, the rocker switch is badan d needs replacing.



BK G WBK

W

W

BR

TM

TIMER MOTOR

BR

TM

1900-2900

PK

OVERFILL SW.FILL VALVE

695-995

PK PK PK

R-Y

R

R-W

OR

BU-OR

BU-OR

OR

R-W

R

R

R-Y

CABINET GROUND

6T

4T

4B

6D6B2C

2T

8T

8B

8C

4C

2B

A

B

DRY TEMP

SELECTOR

SWITCH

HEATER 16-20

DET. DISP.

DOOR SW.

10


13/32

WETTING AGENT DISP ENS ER

This part is located on the left side of the door. It

dispenses a wetting agent just before the final

rinse. This causes water breakdown during rinse.

The water then runs off the dishes and silverware,

leaving fewer or no spots.

CHECKING PROCEDURE






Step1 Pull the connector off the pin type termi-

nals.




of th e pin-type termina ls.


other pin-type term inal.


between .100 to .500 ohms on t he ohm s scale. If not,

the wetting agent actuator is bad and needs replac-

ing.

Step6 Reconnect the connector by pushing this

over the pin type term inals.

When the door is opened for loading, the wetting

agent flows into the dispensing chamber because

the sealing ball has fallen away from its sealing

position.

During th e final rinse, current flows to the bimeta l

heat er. This cau ses it to warp downward. The valve

then opens and a small amount of wetting agent

(approximately 1 cc or .03 oz.) flows into the dish-

washer.

When the door is closed, the sealing ball rolls back

into its sealing position an d seals t he n ow full dis-

pensing chamber.

RINSE

CONDITIONER

LIQUID

VALVE CLOSED

CHAMBER

BALL

OUTER DOOR PANEL

RESERVOIR

RINSE CONDITIONER

LIQUID

BALL SEATED

CHAMBER

VALVE CLOSED

RESERVOIR

RINSE CONDITIONER

LIQUID

BALL SEATED

VALVE OPENS

BIMETAL

WARPS OPEN

HEATER

18

W-R W

W

W

W-R

W-R

BR-WBR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

WR-YR-Y

FILL VALVE

845

5

6

4

11

22

7

3

TIMERMOTOR START

RELAYTIMER

MOTOR

S.I.S. V V

BU BU-WBU

Y

GY 4

3

2

1

2

1

RUN

WASH

DRAIN

WASH LIGHT

11


14/32

DETERGENT DISPEN SER

This part is located on the left side of the door. It

has two dispenser cups, one with a cover and one

without. The cup without a cover, dispenses its de-

tergent as soon as the door is closed. This helps

remove heavier deposits at the beginning of the

cycle. At the proper time in the selected cycle, thetimer completes a circuit to th e magn ets or bimetal

heater (whichever is used) of the dispenser with a

cover. The bimetal warps and releases the spring

loaded cover latch, releasing the det ergent int o the

dishwasher.

CHECKING PROCEDURE








the detergent dispenser. This procedure should as-

sure that the right wire is reconnected to the right

term inal after checking or replacement.

OR

Pull apart the connectors from the coil (magnets)

and t he wiring harness.

Step2 If you have the magnets, refer to the in-

structions that came with your ohmmeter to findthe proper scale to measure 1,500 to 2,000 ohms.

Set th e ohms scale and ZERO th e meter.

OR

If you have the bimetal heater, set the ohmmeter

scale to the lowest ohms setting and ZERO the

meter.


of the terminals either inside the connector or on

the bimetal.


oth er ter minal either ins ide the conn ector or on th e

bimetal.


between 1,500 to 2,000 ohms when checking the

connector (magnets) or ZERO resistance (continu-

ity) or less than one ohm, when checking the bi-

metal. If not, the coil (connector) or the actuator

(bimetal) is bad an d n eeds replacing.

Step6 Reconnect all the wires to the properterm inals as previously mark ed.

NOTE: On the bimetal type DO NOT connect it

across 120VAC. It takes 20 to 30 seconds for the

bimetal to open th e valve.

HEATER

18

W-R W

W

W

W-R

W-R

BR-WBR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

WR-YR-Y

FILL VALVE

845

5

6

4

11

22

7

3

TIMERMOTOR START

RELAYTIMER

MOTOR

S.I.S. V V

BU BU-WBU

Y

GY 4

3

2

1

2

1

RUN

WASH

DRAIN

WASH LIGHT

12


15/32

P US HBU TTON SWITCH

This part located in the console, is used in selecting

the type of wash and dry cycles. Pushbuttons are

mechanically linked t o the various switches. When

th e selected cycle or ener gy option butt on is pushed ,

it causes the proper switch or switches to open or

close to select the required fill, number of washesand rinses, water action, heat or no-heat, and the

minimum water temperatures when required. The

timer switch or switches, in series with the push-

butt on switches, contr ol the sequence of th ese vari-

ous fun ctions a nd th e time they ar e operable in the

cycle.

CHECKING PROCEDURE








the pushbutton switch. This procedure should as-

sure that the right wire is reconnected to the right

term inal after checking or replacement.



Step3 Check each circuit by pushing in on the

pushbutton to each setting and check the proper

terminals.

Use the following chart . Your push butt on switch

may not ha ve all th e settings shown.

Terminals shown in each setting must show ZERO

resistance (continuity).

This is a typical diagra m; refer t o your own wiring

diagram for proper termina l markings.

PUSHBUTTON TERMINAL MARKING

NO. ON SWITCH

1 W-BK to W-G, OR to R

2 W-BK to P-BK, W-BK to W-G

W-G to P-BK, OR t o R

3 W-BK to P-BK, OR to R

4 W-BK to P-BK, OR to R

5 W-BK to P-BK, W-Y to W-T

6 W-BK to P-BK, W-Y to W-T

7 Must be open P-BK to T-R

8 Must be open OR to W-R

Step4 EXAMP LE: Push the number 3 button

(from the left). This closes contacts inside the

switch, W-BK to P -BK and OR to R.


term inal W-BK.


term inal P-BK.


tan ce (cont inuity). If not, th e push butt on switch is



terminal OR.


terminal R.


tan ce (cont inuity). If not, th e push butt on switch is




TIMER MOTOR

W

T-R

W

W

T-R W-BK

W-BK

W-BKW-BK

T-RN.O.

DELAY/HEAT LIGHTTHERMOSTAT

22

28

31 33

39

12

19

6

11DET. DISP.

O-BK W-RO-BK

W-R

W-R

W-R

T-R

W-TW-YW-Y

R

OR

R

OR

W-G

P-BK

W-G

P-BKF

D

K

E

H

C

13


16/32

WATER INLET VALVE

This par t is located behind t he bottom access pan el.

On Built-In Models, the valve is located on the left

side an d on Port able Models, th e valve is locat ed on

the right. This single coil inlet valve is mainly a

shut-off valve for controlling water entering the

dishwasher.

CHECKING PROCEDURE








the inlet valve. This procedure should assure that



OR

Pu ll th e connectors apar t.



500 to 2,000 ohms. Set the ohms scale and ZERO

the meter.


of th e termina ls.

Step4 Touch the other ohmmeter probe to theother terminal.


between 500 to 2,000 ohms on the ohms scale. If

not, the water inlet valve is bad and needs replac-

ing.



HEATER

18

W-R W

W

W

W-R

W-R

BR-WBR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

WR-YR-Y

FILL VALVE

845

5

6

4

11

22

7

3

TIMERMOTOR START

RELAYTIMER

MOTOR

S.I.S. V V

BU BU-WBU

Y

GY 4

3

2

1

2

1

RUN

WASH

DRAIN

WASH LIGHT

COIL

ARMATURE

DIAPHRAGM

PRESSURE

PLATE

FLOW

WASHER

SCREEN

VALVE CLOSED

FL

O

W

COIL

ARMATURE

DIAPHRAGM

PRESSURE

PLATE

FLOW

WASHER

SCREEN

VALVE OPEN

FLOW

FL

OW

14


17/32

OVERFILL SWITCH

This switch is located behind the access panel, on

the right side, underneath the tub. This is a nor-

mally open (N.O.) switch that is kept closed by the

weight of the float. This switch is in series with the

fill valve. This switch is used as an overfill protec-

tion safety switch only. It does not cont rol the wat erfill as this is time-controlled through the timer. If

an overfill situation occurs, this switch opens,

breaking the circuit to the inlet valve and shutting

it off. The float is located in the tub, in the front

right corner u nder t he lower dishrack.

CHECKING PROCEDURE








the overfill switch. This procedure should assure

th at t he right wire is reconnected to th e right term i-

na l after checking or replacement.

Step2 Set th e ohm meter scale to the lowest ohms


Step3 With the float or lever in the down posi-

tion, touch and hold one ohmmeter probe to one of

the terminals.


other terminal.


tance (continuity) with the float or lever down. If

not, th e overfill switch is bad an d n eeds replacing.

Step6 With th e float or lever in t he u p position,

touch and hold one ohmmeter probe to one of the

terminals.


other terminal.


circuit with the float or lever up. If not, the overfill

switch is bad a nd n eeds replacing.



HEATER

18

W-R W

W

W

W-RW-R

BR-WBR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

WR-YR-Y

FILL VALVE

845

5

6

4

11

22

7

3

TIMERMOTOR START

RELAYTIMER

MOTOR

S.I.S. V V

BU BU-WBU

Y

GY 4

3

2

1

2

1

RUN

WASH

DRAIN

WASH LIGHT

15


18/32

HEATER

This heat er is located in th e middle, inside the tu b.

It keeps the water temperature at 140F during

washing and rinsing and also helps dry the dishes

dur ing the dr y cycle. This heat ing element serves as

a r esistance and is in series with th e detergent and

wetting agent dispensers. When th e heater elementis used in drying, dry room air is pulled in at the

bottom of the door and heated by the heating ele-

ment. Air flows upward by convection (like a chim-

ney), picking up moisture from th e wet dishes, an d

escapes through a screened exhaust vent in the top

front of the door.

CHECKING PROCEDURE








the heater. This procedure should assure that the

right wire is reconn ected to the r ight term inal after

checking or r eplacement .



10 to 30 ohms. Set the ohms scale and ZERO the

meter.


of the hea ter ter mina ls.


S t e p 5 The ohmmeter should show a reading

aroun d 10 to 30 ohm s on th e ohms scale. If not, th e

heat er is bad and needs replacing.

GROUNDING CHECK




fra me of the dishwa sher.


circuit. If not, the h eater is bad an d needs r eplacing.



HEATER

18

W-R W

W

W

W-R

W-R

BR-WBR

BR

LBU

O-BK

LBU

O-BK

OVERFILL SW.

WET AGENT

DET. DISP.

W-R

WR-YR-Y

FILL VALVE

845

5

6

4

11

22

7

3

TIMERMOTOR START

RELAYTIMER

MOTOR

S.I.S. V V

BU BU-WBU

Y

GY 4

3

2

1

2

1

RUN

WASH

DRAIN

WASH LIGHT

HEAT ELEMENT

16


19/32

THERMOSTAT

This part is located behind the access panel and

held against the bottom of th e tub by a spring type

bracket. This thermostat keeps turning the timer

OFF and t he hea ter ON to keep the wat er tem -

perature at 140F. When the thermostat is open,

the circuit must go through the high-resistanceneon light which does not pass enought current to

run the timer motor. This stops the timer from ad-

vancing th rough t he cycle.

CHECKING PROCEDURE







ing each wire a ccording to the t ermina l mar king onthe t hermostat. This procedure should assure th at






of th e termina ls.


other terminal.


circuit. If not, the thermostat is bad and needs re-

placing.

Step6 Place the th ermostat face down (termina ls

up) in an electr ic skillet.

Step7 Turn the electric skillet ON to 155F.

When the electric skillet reaches this temperature,we can t est the th ermostat.

NOTE: Be careful not to touch the thermostat and

electr ic skillet which ar e very hot.

NOTE: To avoid damage to the ohmmeter, do not

let th e wires touch th e sides of th e electr ic skillet.


of th e termina ls.


other terminal.


tan ce (cont inuity). If not, th e ther mostat is bad an d

needs r eplacing.



NOTE: Dont forget t o tur n t he sk illet OFF an d

let th e th ermostat cool before removing it from the

skillet.

THERMOSTAT

W-BK N.O.T-R

TM-WT-R

T-M

TIMER MOTORDELAY/HEAT

T-R

13

W-BK

28

24

25

34

P-BK

BU-R

W-BR W-BR W-BK

W-BK

W-BK

BU-R

P-BK

P-BK

T-R

GY-P

C

D

B

N

PUSHBUTTON

17


20/32

DR IVE MOTOR

This par t is located behind th e access pan el and in

th e middle of the tu b. This motor pr ovides the dr iv-

ing force for the pump. It is a reversible type motor

driving a pump impeller (clockwise) in one direc-

tion, washing the dishes, then changes direction

and drives the impeller (counterclockwise) in theother direction for dra ining of th e water .

CHECKING PROCEDURE








th e drive motor. This procedure sh ould assure t ha t

the right wire is reconnected to the right terminalafter checking or r eplacement .

OR

Pu ll apa rt t he two connectors.



GROUNDING CHECK


motor housing.

Step4 One at a time, touch the other ohmmeter

probe to termina ls 1, 2, 3, and 4.

Step5 The ohmmeter should show an opencircuit wh en ea ch of th e term ina ls is checked. If not,

the dr ive motor is bad and n eeds replacing.

RUN WINDING


ter min al no. 1 (Blue).


terminal no. 4 (White).


between 1-4 ohm s on t he ohms scale.

Step9 If you do not get this reading, the drive

motor is bad a nd n eeds replacing.

1 2 3 4

COLOR

WIREBLUE GRAY

OR

BLACK

YELLOW WHITE

TERMINAL NO.

W-V

DELAY

START

LIGHT

LBU

BR

GY

Y

V

BU BU

TIMERMOTOR START

RELAY

DRIVE

MOTOR

OVERFILL SW.

WET AGENT

FILL VALVE

845

2

3

1 4RUN

WASH

DRAIN

W

WBR BR-W

V

BU-V

LBU W-R4

5

1

2

3

11

6O-BK O-BK

WW-R

W-R

W-R

HEATER

18DET. DISP.

18


21/32

START WINDING-DRAIN


th e ter mina l no. 3 (Yellow).




between 3-8 ohm s on th e ohms scale.


motor is bad and needs replacing.


term inals as previously marked.

Step10 Touch and hold one ohmmeter probe toth e term inal n o. 2 (Gra y or Black).




between 3-8 ohm s on th e ohms scale.



START WIND ING-WASH

S.I.S.

BU

7

3

TIMER

BU

MOTOR START

RELAYTIMER

BU-W

V V Y

GY

2

1

RUN 1

WASH 3

DRAIN 24

MOTOR

W

TIMER

S.I.S.7

3

BU BU

MOTOR START

RELAYTIMER

BU-W

V V

2

1

Y

GY

RUN 1

WASH 3

DRAIN 24

MOTOR

W

19


22/32

START RELAY

The sta rt r elay is used in getting voltage to the sta rt

wash winding or t he sta rt drain winding.

The initial start ing current passes through the re-

lay coil since it is in series with the motor's RUN

windings. The starting current surge causes the re-

lay coil to produce a strong magnetic force, attract-

ing the steel arma tu re an d closing the switch in th e

relay. As t he m otor appr oaches full speed, the ini-

tial surge of current will diminish. The magnetic

force of th e rela y will also diminish , since the r elay

coil car ries th e sam e am perage. At about 2/3 motor

speed, the ma gnetic force weakens to th e point th at

th e weight of th e arm at ure overcomes th e magnetic

force, allowing the armature to drop and open the

relay cont acts. This de-energizes the st art winding,

and t he motor continues ru nning on t he run wind-

ing.

This st ar t r elay could be locat ed in one of the follow-

ing places. Either behind the toe panel (built-in

models), or behind t he a ccess pan el and coverplate

(port able m odels).

CHECKING PROCEDURE






Step1 Remove one wire a t a t ime, car efully label-ing each wire a ccording to the t ermina l mar king on

the st art relay. This procedure should assure th at






term inal mar ked M, BU, or 3.


term inal ma rked M, BU (different term inals), or 4.


ta nce (continuity). If not, the st ar t r elay is bad a nd

needs r eplacing.


an y termina l mar ked M, BU, 3, or 4.


term inal ma rked S, V, or 2.


circuit. If not, the start relay is bad and needs re-

placing.

Step9 Remove the start relay and tur n it u pside

down.


the t ermina l mark ed M, BU, or 3.


term inal ma rked M, BU (different term inals), or 4.


tan ce (cont inuity). If not, th e star t r elay is bad a nd

needs r eplacing.


the t ermina l mark ed S, V, or 2.

Step14 Touch the other ohmmeter probe to each

term inal ma rked M, BU, 3, and 4.


tan ce (cont inuity). If not, th e star t r elay is bad a nd

needs r eplacing.



W-V

DELAY

START

LIGHT

LBU

BR

GY

Y

V

BU BU

TIMERMOTOR START

RELAY

DRIVE

MOTOR

OVERFILL SW.

WET AGENT

FILL VALVE

845

2

31

4RUN

WASH

DRAIN

W

WBR BR-W

V

BU-V

LBU W-R4

5

1

2

3

20


23/32

CHAP TER 2

ELECTRICAL COMP ONENTS

(for P lastic Line r Mode ls: 1986 and Ne w er)

See Chapter 1 for a ll compone nts not cove red in this se ct ion.

TIMER

ENERGY SAVING

DRY SELECTOR

SWITCH

DOOR LATCH

SWITCHES

THERMAL FUSE

HEATER ELEMENT

FLOAT SWITCH

MOTOR

RELAY

WATER INLET

VALVE

21


24/32

TIMER

The timer is located in th e console and is th e hear t

of the dishwasher . Its function is t o control the t im-

ing of the dishwash er.

All timers used on dishwashers operate the same

but are somewhat different in looks. Due to func-

tions or features of different models, some timers

have more terminals and internal switches (con-

tacts) tha n others.

The dash line represents t he actual t imer where as

th e bold lines indicate inter na l switches within th e

timer.

On quick-disconnect timers, the different colored

ha rn ess wires are placed inside a block which plugs

into the timer. The possibility of wiring the timer

wrong is greatly redu ced.

CHECKING PROCEDURE








Step2 Remove the disconnect block. The blocks

ha ve tabs on each end which must be pressed while

pu lling on th e block.



not fill.


terminal T.


terminal BR.


ta nce (continuity). If not, th e timer is bad a nd n eeds

replacing.

Step7 If the door switch is good but the dish-

washer still wont sta rt wh en th e timer kn ob is

pulled out, check the internal timer push/pull

switch (PB. SW.) conta cts.

Step8 Pu ll th e timer knob out.


terminal T.


term inal W-BK.


tan ce (cont inuity) with th e timer knob pulled out. If

not, the timer is bad an d needs replacing.

The ohmmeter should show an open circuit with th e

timer knob pushed in.

Step12 Place the colored terminal block back on

the t imer in th e proper position.

WGBK

CABINET

GROUND

LINE 120 V. 60HZ

BKT

DOOR SWITCH

W-T

T-R

TIMER M

CLEAN LIGHT

T

T-R

T-R

T-R

T-R

T-R

P-BK

GY-BK

BU-BK

W-BK

PB. SW.

D

R

F

PB. SW.

PB. SW.

29

22

28

26

31

30

TIMER

N.O.

N.C.

Y-BU

W-BU

R W-R

W-BU

W-R

K

H

THERMOSTAT

CLOSES 130- 140

33

27

19

6

5

1

2

3

BR

GY

Y

V

BU

BR

GY

Y

VBU

MOTOR START

RELAY

BU-W

M

OVERFILL SW.

FILL V

BU-W

BR-W

DRAIN

WASH

RUN

THERMOSTAT

HI-LIMIT

OPENS 175- 185

DELAY START

22


25/32

DOOR SWITCH

The purpose of the single-pole, double-throw door

switch is to stop the dishwasher when the door is

opened. A bad door switch could cause the dish-

washer to keep run ning with th e door open or not to

ru n with th e door closed.

CHECKING PROCEDURE








th e door switchs. This procedur e should assur e tha t





tep3 With t he switch actu ator pressed, touch an d

hold one of the ohmmeter probes to one of the

switch term inals.


oth er term inal on th e same switch.


ta nce (cont inu ity). If not, th e door switch is bad a ndneeds r eplacing.

Step6 With the actuator open, touch and hold

one of the ohmmeter probes to one of the term inals.


other terminal.


circuit. If not, the door switch is bad and needs

replacing.

Step9 Repeat steps 2-8 with the other door

switch.



WGBK

CABINET

GROUND

LINE 120 V. 60HZ

WBKT

DOOR SWITCH

W-T

T-R W-V

TIMER MOTOR

CLEAN LIGHT

T

T-R

T-R

T-R

T-R

T-R

W-V

P-BK

GY-BK

BU-BK

W-BK

PB. SW.

D

R

F

PB. SW.

29

22

28

26

31

30

TIMER

N.O.

Y-BU W-BU

K

THERMOSTAT

CLOSES 130- 140

33

DOOR

SWITCH

DOOR LATCH

RETAINING PINS

SWITCHES

23


26/32

WGBK

CABINET

GROUND

LINE 120 V. 60HZ

WBKT

DOOR SWITCH

W-T

T-R W-V

TIMER MOTOR

CLEAN LIGHT

T

T-R

T-R

T-R

T-R

T-R

W-V

W-V

W-V

W-V

P-BK

GY-BK

BU-BK

W-BK

PB. SW.

D

R

F

PB. SW.

PB. SW.

29

22

28

26

31

30

TIMER

N.O.

N.C.

Y-BU

W-BU

R W-R

OR

W-BU

W-R

K

H

THERMOSTAT

CLOSES 130- 140

33

27

19

6

5

1

2

3

BR

GY

Y

V

BU

BR

GY

Y

VBU

MOTOR START

RELAY

BU-W

DRIVE

MOTOR

OVERFILL SW.

FILL VALVE

BU-W

BR-W

DRAIN

WASH

RUN

THERMOSTAT

HI-LIMIT

OPENS 175- 185

DELAY START

HEATER

DOOR

SWITCH

HEATER

ELEMENT

HEATER

This heat er is located in th e middle, inside the tu b.

It keeps the water temperature at 140F during

washing and rinsing and also helps dry the dishes

during the dry cycle. When the heater element is

used in drying, dry room air is pulled in at the

bottom of the door and heated by the heating ele-ment. Air flows upward by convection (like a chim-

ney), picking up moisture from th e wet dishes, an d

escapes through a screened exhaust vent in the top

front of the door.

CHECKING PROCEDURE






Step1 Remove one wire a t a t ime, car efully label-ing each wire a ccording to the t ermina l mar king on

the heater. This procedure should assure that the

right wire is reconn ected to the r ight term inal after

checking or r eplacement .






other terminal.

S t e p 5 The ohmmeter should show a reading

aroun d 15 to 25 ohm s on th e ohms scale. If not, th e

heat er is bad and needs replacing.

GROUNDING CHECK




fra me of the dishwa sher.


circuit. If not, the h eater is bad an d needs r eplacing.



24


27/32

WGBK

CABINET

GROUND

LINE 120 V. 60HZ

WBKT

DOOR SWITCH

W-T

T-R W-V

TIMER MOTOR

CLEAN LIGHT

T

T-R

T-R

T-R

T-R

T-R

W-V

W-V

W-V

W-V

P-BK

GY-BK

BU-BK

W-BK

PB. SW.

D

R

F

PB. SW.

PB. SW.

29

22

28

26

31

30

TIMER

N.O.

N.C.

Y-BU

W-BU

R W-R

OR

W-BU

W-R

K

H

THERMOSTAT

CLOSES 130- 140

33

27

19

6

5

1

2

3

BR

GY

Y

V

BU

BR

GY

Y

VBU

MOTOR START

RELAY

BU-W

DRIVE

MOTOR

OVERFILL SW.

FILL VALVE

BU-W

BR-W

DRAIN

WASH

RUN

THERMOSTAT

HI-LIMIT

OPENS 175- 185

DELAY START

HEATER

DOOR

SWITCH

WATER INLET VALVE

This par t is locat ed behind th e bottom a ccess pan el

on th e left side. This single coil inlet va lve is ma inly

a shut-off valve for controlling water entering the

dishwasher.

CHECKING PROCEDURE






Step1 Remove the harness connector from the

inlet valve.



500 to 2,000 ohms. Set the ohms scale and ZERO

the meter.


of th e termina ls.



between 500 to 2,000 ohms on the ohms scale. If

not, the water inlet valve is bad and needs replac-

ing.

Step6 Replace the harness wire connector onto

the inlet valve and pu sh on un til it sn aps int o place.

25


28/32

WGBK

CABINET

GROUND

LINE 120 V. 60HZ

WBKT

DOOR SWITCH

W-T

T-R W-V

TIMER MOTOR

CLEAN LIGHT

T

T-R

T-R

T-R

T-R

T-R

W-V

W-V

W-V

W-V

P-BK

GY-BK

BU-BK

W-BK

PB. SW.

D

R

F

PB. SW.

PB. SW.

29

22

28

26

31

30

TIMER

N.O.

N.C.

Y-BU

W-BU

R W-R

OR

W-BU

W-R

K

H

THERMOSTAT

CLOSES 130- 140

33

27

19

6

5

1

2

3

BR

GY

Y

V

BU

BR

GY

Y

VBU

MOTOR START

RELAY

BU-W

DRIVEMOTOR

OVERFILL SW.

FILL VALVE

BU-W

BR-W

DRAIN

WASH

RUN

THERMOSTAT

HI-LIMIT

OPENS 175- 185

DELAY START

HEATER

DOOR

SWITCH

1

2

3

4

DR IVE MOTOR

For th e (Power Clean) pump a nd m otor, see page 18

an d for t he (Horizontal) pump an d m otor, see below.

This par t is located behind th e access pan el and in

th e middle of the tu b. This motor pr ovides the dr iv-

ing force for the pump. It is a reversible type motor

driving a pump impeller (clockwise) in one direc-

tion, washing the dishes, then changes direction

and drives the impeller (counterclockwise) in the

other direction for dra ining of th e water .

CHECKING PROCEDURE






Step1 Remove the wire connector from the motorby pressing the ta b, th en pull.



GROUNDING CHECK


motor housing.

Step4 One at a time, touch the other ohmmeter

probe t o ter min als W-V, BU-W, Y, an d GY.

Step5 The ohmmeter should show an opencircuit wh en ea ch of th e term ina ls is checked. If not,

the dr ive motor is bad and n eeds replacing.

RUN WINDING


terminal W-V.


term inal BU-W.


between 2-12 ohms on t he ohms scale.


motor is bad a nd n eeds replacing.

26


29/32

START WIND ING-WASH


th e term inal W-V.


term inal Y.

Step12 The ohmmeter should show a readingbetween 1-7 ohm s on th e ohms scale.



START WINDING-DRAIN


th e term inal W-V.


term inal GY.

Step16 The ohmmeter should show a readingbetween 2-12 ohm s on th e ohms scale.



Step18 Replace the harness wire connector onto

th e motor an d push on un til it sna ps into place.

27


30/32

NOTES

28


31/32

BLANK


32/32

BLANK

Dishwasher 2

Documents