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GE ZISS420DRCSS side-by-side refrigerator - Freezer cold,

refrigerator warming. Lots of...
GE ZISS420DRCSS side-by-side refrigerator - Freezer cold, refrigerator warming. Lots of troubleshooting so far.
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Answered in 27 minutes by:
8/2/2017
Billy Olenick
Billy Olenick, Customer Service
Category: Appliance
Satisfied Customers: 128
Experience: Owner at Billy's appliance repair
Verified
My name is ***** ***** I will be helping you out today with your appliance repair. We are on an honor system here and are only paid for our services once we are rated so please don't hesitate to rate me. I will continue to help you through your appliance repair even after you rate me. Thank you.
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Do you have frost on the rear panel inside the freezer?
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Customer reply replied 5 months ago
Not yet. Eventually it will. Seem like defrost is not working. Condensation on top of fridge where cold air duct come in though.
If you do get frost then yes you have a defrost issue and we need to test out parts. Do you have a volt meter?
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Customer reply replied 5 months ago
Did you get the resistance values already?
Shop for PartsZISS420DRCSSXHelp me find my model #Large AppliancesLawn EquipmentHeating & CoolingPower ToolsAccessoriesRepair HelpRepair Help LibraryMoreMy OrdersRepairClinic.com LogoZISS420DRCSSXSelect a product typeAir ConditionerCentral Air ConditionerChainsawDehumidifierDishwasherDryerEdgerFreezerFurnaceGarbage DisposerHedge TrimmerHot Water DispenserHumidifierIce MachineLawn MowerLeaf BlowerMicrowaveOven/Micro. ComboPole PrunerPressure WasherRange Vent HoodRange/Stove/OvenRefrigeratorSmall EngineSnowblowerString TrimmerTillerTrash CompactorVacuum CleanerWasher/Dryer ComboWashing MachineWater Filtration SystemWater Heater« BackGE Refrigerator Not DefrostingZISS420DRCSSThe part(s) or condition(s) listed below for the symptom Refrigerator not defrosting are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page. Below, view any available part testing videos for each item.Symptom VideoHow It Works VideoDisassembly VideoShow all parts for model ZISS420DRCSSFor the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.GE Refrigerator Defrost Heater AssemblyRepairClinic Item # 305049How it
works:Description:Helpful
Tip:The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, the defrost system will not work, and frost will continue to accumulate on the evaporator coils. To determine if the defrost heater is defective, use a multimeter to test it for continuity. If the defrost heater does not have continuity, replace it.Skill LevelPart Testing VideoGE Refrigerator Defrost ThermostatRepairClinic Item # 946924How it
works:Description:The defrost thermostat monitors the temperature of the evaporator coils. When the coils drop below a set temperature, the thermostat contacts close to allow power to flow to the defrost heater during the defrost cycle. In the defrost cycle, the defrost heater melts away any frost that may have accumulated on the evaporator coils. If the defrost thermostat is defective, the thermostat contacts will not close. As a result, the thermostat won’t provide power to the defrost heater. To determine if the defrost thermostat is defective, use a multimeter to test it for continuity. If the defrost thermostat does not have continuity when it reaches the low temperature of its operating range, replace it.Skill LevelGE Refrigerator Main Control BoardRepairClinic Item #(###) ###-####
How it
works:Description:The main control board regulates the power supply to all of the refrigerator components, including the defrost system. If the main control board is defective, it may stop sending voltage to the defrost system. Control boards are frequently misdiagnosed—before replacing the main control, first test all of the defrost system components. If none of the defrost system components are defective, consider replacing the main control board.Skill LevelOrder now and this item will ship out tomorrowShow all parts for model ZISS420DRCSS« BackJoin Our VIP Email ListGet discounts and money-saving tips today.JOINCall Us: 1-***-***-****(Available 7 days a week)Follow RepairClinicCustomer Service CenterContact Us© 2017RepairClinic.com, Inc.Terms of UseTerms of SalePrivacy PolicyFull Site
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The thermistor should test inbetween 11 and 22
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Let me know what else you need
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Customer reply replied 5 months ago
I'm not sure what you sent me. Is that voltage you are referring to (11 - 22 VAC, VDC, Ohms)?
So far:
Door seals good.
Door damper open (no blockage) and resistance value of motors (both windings) good compared to new damper.
All 4 thermistors good resistance compared to temp/resistance chart.
Defrost circuit measures 38.6 Ohms – Blue connector unplugged (J9 on connector) to J7 pin 9.
Evaporator fan is operating but eventually ices up.
Motherboard replaced 5 days ago and symptoms return. Appears evaporator is icing up (defrost problem) and not allowing airflow across it.
Do you have continuity across the defrost heater while disconnected
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Customer reply replied 5 months ago
read above. 38.6 Ohms.
GE Refrigerator Defrost Thermostat WR50X10035RepairClinic Item #946924‹›Grid is 1 inch square$73.20Have you tested this part. This is the defrost thermostat. Any refrigerator that has a defrost issue I always replace this part.
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Customer reply replied 5 months ago
Have not. Will have to gain access to it by removing ceiling and Styrofoam. Just a switch...opens at 60 and closes at 45. Right?
Customer reply replied 5 months ago
Ok, will dig in as soon as I empty the freezer. I'll get back to you.
Awesome! Please don't forget to rate me please
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Customer reply replied 5 months ago
Ok Billy, prior to disassembling, evaporator thermodisk was closed and temp of disk was aprox 2F. Testing the disk: opened at 65F and closed at 43F. Defrost heater resistance 39.7 Ohms, Fill tube heater resistance 1316 Ohms, Evaporator pan heater resistance 313.3 Ohms. So all values ok. No need to replace any of these.
Okay sense all that is testing out the control board should be the failure.
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Customer reply replied 5 months ago
I just replaced it 5 days ago. You didn't read that above? That's why I'm at a loss and that's why I contacted this site. Any other suggestions other than the board?
Customer reply replied 5 months ago
Just checked wiring (everything disconnected) from motherboard (J7 pin 9) and the following units: fill tube heater (J9), defrost heater (J9), evaporator thermodisc (J9), evaporator drip pan heater (J12), freezer (J7 pin 4 & 7) & fresh food (J7 pin 6 & J11) door switches. All normal. Door switches also function normal disconnected. Unit is pulled from wall now and access made to top of unit. Cleaned condenser coils.
Tom Goellner
Tom Goellner, Home Appliance Technician
Category: Appliance
Satisfied Customers: 1,665
Experience: 32 yrs. experience servicing major appliances and HVAC equipment.
Verified

A common problem is the sensor attached to the evaporator coil. The mother board initiates defrosts , but the sensor terminates it and the sensor can fail and either terminate defrost too quickly or not let it defrost at all. Replace that sensor.

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Customer reply replied 5 months ago
Hi Tom. I've decided since I have everything apart, I changed the evaporator defrost heater, spliced in a new evaporator thermistor and am waiting for the evaporator thermodisc (as you mentioned above) to arrive even though they all tested good. I have nothing to lose but $$. I'll let you know tomorrow night when I plug it pack in. But it usually takes a couple of days before the fresh food side starts warming up due to the restricted airflow across the evaporator.

Yes, let me know

Tom Goellner
Tom Goellner, Home Appliance Technician
Category: Appliance
Satisfied Customers: 1,665
Experience: 32 yrs. experience servicing major appliances and HVAC equipment.
Verified
Tom Goellner and 87 other Appliance Specialists are ready to help you
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Customer reply replied 5 months ago
Hi Tom.
Well after replacing the evaporator defrost heater, evaporator thermister and evaporator thermodisc, and waiting one week now, I can say that it is working again. I don't know which part failed but I'm glad its all back together and functioning normal.
Thanks for your suggestion but I was already on that road. Too bad I didn't get you first since Billy couldn't read my troubleshooting steps.
Thanks again.

Pretty sure it was the evap thermistor - your readings on the other parts checked good . Thanks for giving me a good rating.

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Tom Goellner
Tom Goellner
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