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Author Topic: GE refer compartment cooling coils frosting every 1-3 weeks  (Read 1699 times)

Offline mawinter

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GE refer compartment cooling coils frosting every 1-3 weeks
« on: October 01, 2015, 07:08:46 PM »

The cooling coils in the refer compartment frost up after 1-3 weeks which blocks cold air flow to the upper portion of the refer compartment. After manual defrost works fine for 1-2 weeks and freezer seems fine.

GE side by side refrigerator freezer M# PSH25SGSC SV, S# DL406421

Checked defrost heater, thermostat, and thermistor that connect at pins 1-4 with Com on #5 of plug J1 with Ohm meter and all seem fine. There is a 5th thermistor behind cooling coils in refer but I only found the 4 connections on pins 1-4.

Board was replaced ~2yrs ago with part WR49x10152 per box but label on board said WR49x10147.  At the time supplier said part is box was correct and latest part regardless on P/N on board itself and it worked fine nearly 2 years.

I would guess it is the board if it weren't for the 5th thermistor which I can't test. Door gaskets good so no apparent air leaks and it really works fine except for the upper part of the refer not being cold after the refer coils frost up and block the rear air duct / cooling tower are flow.  The freezer compartment coils were a little frosted when I did the testing but not too bad and only on the bottom 3-4 rows of coils.

 Do you know where that 5th thermistor connects so I can test it?
 Got any ideas what is wrong and how to fix?
« Last Edit: October 01, 2015, 07:10:38 PM by mawinter »

Offline LowSL2

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #1 on: October 01, 2015, 08:31:09 PM »
This is a common issue. I replace the fresh food evap thermistor located behind the evap, the evap drip pan if it's rusted and the evap cover assembly.

Evap cover assembly - WR17X11844
Drain pan - WR17X11804
Thermistor - WR55X10942
LowSL2
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Offline dab147315

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #2 on: October 01, 2015, 10:36:26 PM »
This may help you.

Offline olyteddy

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #3 on: October 01, 2015, 10:38:09 PM »
This is a common issue. I replace the fresh food evap thermistor located behind the evap, the evap drip pan if it's rusted and the evap cover assembly.

Evap cover assembly - WR17X11844
Drain pan - WR17X11804
Thermistor - WR55X10942
That's the PN for the 'most common' GE fridge board. WR55X10025 is the PN for GE Thermistors   :oops:

Offline mawinter

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #4 on: October 01, 2015, 10:46:29 PM »
Thanks for the info that really helps. 
Dab.... That photo you posted is cut off when I open it right where I want to see it.  Can you repost the photo so the full photo is visible?
Also do you know where all those thermistors connect so they can be tested.  I know about pins 1-4 on plug of J1, but which is which and where do the rest plug it.  It would make it a lot easier to test them.
« Last Edit: October 01, 2015, 11:01:29 PM by mawinter »

Offline dab147315

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Offline mawinter

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #6 on: October 02, 2015, 01:18:22 AM »
Thanks you have been very helpful.

Regarding Thermistor testing when they are bad are they usually way off or do you really need to know exactly what temp the thermistor is at to test the ohm's reading accuracy.

For example, I have a fresh food defrost problem.  When checking the Fresh Food Evaporator thermistor when it is frosted up and I check ohms between P1 & P5 on Plug J1 and get 17k ohms.  Is that close enough to assume it is working OK and problem is main board, fan is working.  Or do I really need to put it in ice water to test it at 32F looking for 15.5-17.1 ohms (16.3 =/- 5%)?

Offline dab147315

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Re: GE refer compartment cooling coils frosting every 1-3 weeks
« Reply #7 on: October 02, 2015, 09:06:34 AM »
GE now advises to change that thermistor without removing the thermal block. They say you will never get the block secured back to the evaporator as tight as needed. There is also a service bulletin i don't think it applies to you but good to know about.
« Last Edit: October 02, 2015, 09:09:07 AM by dab147315 »

 

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