7 replies to this topic

[skoobahead]

I have a LG side by side refrigerator LSC29931ST I have an error code DH failed defrosting. I have the service manual which I think is junk, very poor trouble shooting section. Found evaporator iced up. thawed evaporator and applied heat to defrost sensor, did not see much of a change in Resistance values per the service manual.The refrigerator ran for one week before my refrigerator coded same msg.

[DurhamAppliance]

If your heater showed continuity and you did not see any change in sensor, Change sensor. They are quite inexpensive. Good way to test sensor is place in a cup of ice water (mostly ice as you want 32 degrees), leave it in water for 5 minutes...you should get 16k ohms +-5%.

[Samurai Appliance Repair Man]

Good way to test sensor is place in a cup of ice water (mostly ice as you want 32 degrees), leave it in water for 5 minutes...you should get 16k ohms +-5%.

Nice tip, DA.

[skoobahead]

thanks for your reply. checked resistance of defrost sensor, and freezer sensor both check good.checked resistance of defrost heater per LG service manual connector 3 on PCB pins 3 & 7 with connector removed from pcb defrost heater reads open. performed test per service manual pushing test button twice to turn on defrost heater. 120vac at pins 3&7 with connector 3 hooked back up to pcb. freezer was full of food, so could not check and see if defrost heater was heating. how hot does the heater get? wiring diagram shows in-line fuse. if fuse is open, can you change the fuse by it self? or is the fuse built into heater?

[DurhamAppliance]

freezer was full of food, so could not check and see if defrost heater was heating. how hot does the heater get? wiring diagram shows in-line fuse. if fuse is open, can you change the fuse by it self? or is the fuse built into heater?

Heater will glow red when it is on but come on, you received an error code indicating defrost failure, and you gonna test pins and look at some diagram but not have evap exposed to do visual inspections? What, you want us to do all the work? Remove the food and look at your evap, heater and fuse. You will be able to answer quite a few of the questions on your own with a visual inspection and testing heater, fuse for continuity. I know, I know, removing frozen food from a freezer is hard, nasty, back-breaking and sweaty work, but someone has to do it.

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Edited by DurhamAppliance, 03 March 2011 - 11:19 AM.

[SANTA]

Removing all the food from the freezer has one benefit. It's the perfect time for people to do a visual inventory and get rid of old food thats taking up space. Its also about the only time a freezer or frig gets cleaned. I like to watch people empty their freezers and discover things they forgot were there. OH MY! this container says "Blueberries-2006".

[skoobahead]

Ok removed all food from freezer to get access to heater. Heater will only come on when the main PCB test switched is pressed twice. heater reached a temperature of 127 degrees F. PCB shuts off power to heater. Defrost sensor check good, heater checks good. PCB???

[kdog]

Defrost termination is controlled a little different in these units, has a thermister and fuse in the "control" harness that attaches to the evaporator - if the sensor is failing it could throw a wrench in the wheel

http://www.repaircli...Harness/1462588