Dmr Redo Tips 101129 - Copy (2)

8/14/2019 Dmr Redo Tips 101129 - Copy (2)

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Dishwasher Redo Tips

Repair Process

Environmental Issues SE or 5E Drain Error

Use the links shownhere to quicklyaccess the solution

ater upp y rror

oE or 9E Water Level Error

to your problem.

o a er eve rror n y

tE Temperature Sensor Error

1E & 3E High Temperature Errors

Product Support Department

November 2010


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The best person to talk to about the symptom isthe customer, often times the details of apro em can get ost in trans ation an are notlisted on the work order.

Assumin the Main board is the defect because itcontrols everything is a big mistake

Simple things like connectors, plugs and harnessescreate more failures than PC boards.

After the repair go through the entire diagnostictest processes, not just the function that was not

. An extra five minutes spent testing ALL functions mightsave a second call

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Dont overlook the environmentas a poss e ssue Any electronic product requires

proper connection to the hot, neutraland ground leads

A simple AC polarity tester can identifya mis-wired outlet or similar issue

Also check the water pressure

Low water pressure can effect iceproduction or wash time

A water pressure meter can help here

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In order to assure there is a known amount of clean hot water in the tubthe first thing a dishwasher will do when starting a wash cycle is to runthe drain pump to clear out any water.

Normally, the pump will run for about forty-five seconds or until theLow Level sensor confirms there is no water in the tub and that thedrain is unobstructed.

If the low water level is not detected within about three minutes time

the unit will flag a 5E or SE drain error.

Confirm the drain pump and hose are not obstructed Confirm the drain pump is getting power by measuring between

CN202:5(ORG) and CN101:3(YEL).

CN202 and measuring the resistance of the drain pump, (22).If the circuit reads open pull the unit to confirm the connectionsand check the wire harness continuity.

Confirm the operation of the water level sensor.


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When the water valve is activated the flow sensor is monitored toconfirm that water is flowing.

activated after a period of time, the unit will flag a 4E water supplyerror.The water will continue to flow until

FlowMeter

,indicating the water has reached thecorrect level before the wash cycle willbegin. Confirm the water supply is turned on

HighLevel

Sensor Confirm there are no obstructions in the

water supply line or any particles on the filterscreen inside the water connection on the unit

Confirm the water pressure. The unit allowsup to six minutes to complete the fill processbefore flagging this error.

Low

on rm t e water va ve s gett ng power ymeasuring between CN202:1(BRN) andCN101:3(YEL).

Confirm the water valve connection andcontinuity by lifting CN202 and measuring theresistance of the drain pump, (1.2k). If the

Sensor

connections and check the wire harnesscontinuity.


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A 9E error is triggered if the high level sensor is not activated duringthe time allowed for the fill process or if a low level is detected duringthe wash cycle

An oE error is triggered when the water in the case sensor reaches theoverflow sensor and can also be triggered if water reaches the leaksensor in the shutter area while the water supply valve is open.

FlowMeter

OverflowSensor

sensor connectors using CN302:4(ORG) ascommon, check CN301:5(SKY) for overflowor CN301:8(WHT) for Leakage, measuring

3.5Vdc if there is any moisture on thesesensors

LevelSensor

.Any variation in how level the machine iscould contribute to flagging a potentiallyfalse error. If the machine is tilted to theright or to the rear the level in the casesensor could be low enough to trigger a 9Elow-level water error. Machines tilted to the

Low

left or to the front would be more susceptibleto oE over-level water errors, and may havewater coming out from around the door.

Try disconnecting the sensors to see if thesame errors are still flagged. If so, the MainPCB may be at fault.

Sensor


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An oE error is triggered when the water in the case sensor reaches theoverflow sensor and can also be triggered if water reaches the leaksensor in the shutter area.

While the water supply valve is open it isossible to tri er an over flow error as

This chamber

fills with waterduring the fillTransfe

water in the break is transferred to the casesensor and the water level in the sensorseeks the same level as the water in the

.r toCase

Sensor

u .

Confirm the case break, sensor, andhose are clean and free of debris that

WaterInlet

might interfere with the flow ordetection of water in the system.

If the water drains from the case break

OverflowSensor

,causing an error, there may be a crackin one of those assemblies

Try disconnecting the sensors to see ifthe same errors are still flagged. If so,

the Main PCB may be at fault.


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Because the temperature sensor is used as a key monitor for severaldifferent functions, the unit will check to confirm the thermistor isconnected and operational before it triggers any functional errors.

Any measurement outside the range of

0.2Vdc to 4.5Vdc means thethermistor is disconnected, shorted, or

. Confirm these voltages yourself by

measuring between CN301:9(BLACK)

and CN302:5(PINK).o con rm t e connect on an

continuity of the sensor pull one of theconnections to measure the resistanceof the sensor.

Note that the thermistor will decreasein resistance as the temperature goeshigher and that the thermistors

.


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thermistor to assure the heater is working properly.

An HE heater error may be flagged during the wash or rinse cycle ift e temperature o t e water oes not ncrease more t an , ,

within ten minutes of switching on the heater.

Random heater errors with no a arent cause ma be the result of amarginal or out of spec thermistor.

You can confirm the heater coil resistance of

about 15 by carefully lifting the RED heaterwire from T202 and measuring the resistance Heater.

If the circuit appears open pull the machine tocheck the resistance directly on the heaterterminals and to confirm the continuity of thewiring harness.

Before replacing the heater, confirm that the

cycles. You can measure 120VAC acrossterminals T202 and CN101:4(YELLOW) with theheater connected.

Voltage is supplied during wash cycle duringthe main wash and the last rinse, or when

, .

or


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On the other end of the temperature scale the unit will also flag errors ifthe temperatures detected by the thermistor exceed 80C, (176F).Temperatures in this range can scald skin practically on contact and

A 3E error will be flagged when the thermistor detects thesetemperatures when the water supply is ON.

A 1E error is flagged when these temperatures are detected during the

wash or rinse cycles.

Random errors with no apparent cause may be the result of a marginal orout of spec thermistor.

dishwasher to assure that it is no higher than the 120~130maximums recommended by the Consumer Products SafetyCommission.

Confirm the operation of the thermistor

Confirm the heater element is switched on and off by the unit.

Dmr Redo Tips 101129 - Copy (2)

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