Question about Sub-Zero Refrigerators

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MY SUBZERO 532 REFRIGERATOR SIDE EVAPORATOR ICES UP. AFTER A MANUAL DEFROST IT WORKS FINE FOR FIVE OR SIX DAYS, THEN I BEGIN TO NOTICE A LITE FROST STARTING ON THE BACK WALL. A TECH THOUGHT IT MIGHT BE A FREON LEAK (I FREAKED OUT AT THE ESTIMATE) NOW IT IS ALMOST ONE YEAR LATER. THE REFRIGERATOR STILL COOLS EVENLY UNTIL THE EVAPORATOR GETS FROZEN UP. CAN A LEAK BE THAT SLOW BECAUSE AFTER A YEAR AS IT SEEMS THERE STILL IS COOLANT IN THE SYSTEM? ? ? I THOUGHT IT MIGHT BE A FAN (THE ONE AT THE TOP OF THE REFRIGERATOR BEHIND THE LIGHTS) OR THERMOSTAT PROBLEM AND GOT THOSE REPLACED. IS THERE ANY KIND OF DEFROST CYCLE IN THE 532???

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  • sharon764 Sep 15, 2008

    Dear Doc John

    A manual switching off for an hour got rid of frost. The refrigerator doesn't seem to cycle off even tho a new sensor has been put in place. This am the temp was 29 degrees (no freezing, thankfully) even tho my temp dial was set at ONE. I appreciate your suggestion about the defrost timer. I did locate it, as you said, on top near the compressor. The wiring schematic was also up there and I checked that out.
    The defrost timer according to the specs for the 532 is connected only on the freezer side and its freezer compressor via the purple wire. I'm no electrician, am not educated in such things. The schematic show a "refrigerator control" (would that be the temp sensor assembly?) which is wired to the fan switch and fan motor and to the refrigerator compressor via the compressor starting relay. Could a relay defect keep the compressor running and not shutting or cycling off? Is that possibly another place to consider? Just asking. I don't know much 'bout nuthin'.


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Hi thanks for the question you do have a no defrost problem The defrost timer is not advancing to the defrost cycle The timer is located on the top where the compressor is located do ypu have an owners manual if you do you should have a bresk down of that fridge So replace the timer thanks The appliance doc

Posted on Sep 12, 2008

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My ice maker not making enough ice . I have already check the water. thank you


When an icemaker slows production, the problem is not the icemaker at all but the temps in the freezer warming up because of an airflow problem either in the freezer compartment evaporator coils or underneath the unit that being the condenser coils. (Fan not working or lint blockage)
Airflow problems in the freezer compartment are caused by the fan or the automatic defrost system not functioning properly so yu end up with an ice block / lots of frost in the freezer compartment on the back wall of the compartment.

Check for ice or large amounts of frost in the freezer compartment. If you note ice / excessive frost, unplug the unit, empty the freezer compartment and do a manual defrost by directing an external fan into the compartment for just over 2 hours. This will ensure the evaporator coils and the freezer compartment drain have thawed. While the manual defrost is in progress remove the rear fiberboard cover from the compressor access and check / clean the condensor coils and fan area.
After 2 hours clean up the excess water.. reassemble the rear cover and return the unit to NORMAL service. It should start making lots of ice in 4 to 6 hours. Here is the kicker... if there is an auomatic defrosting problem your icemaker will after 2 - 3 days again slow ice producion and ice will build up in the evaporator area. You will have to keep repeating the manual defrosting process every 3 to 4 days until the automatic defrost system is repaired.

There are 3 main components of the Automatic defrost system:
1. Defrost control
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Most of the time the problem is either the defrost control or the heater that fails and the unit stops defrosting.

Your parts can be found here:
http://www.searspartsdirect.com/partsdirect/part-model/LG-Parts/Refrigerator-Parts/Model-LSC26905TT/3204/0165000

Thanks for choosing FixYa,
Kelly

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Ignore the fan operation... That is perfect.

You are likely experiencing a DEFROST failure
(most commonly a defrost timer failure)...
part number 3081180 item 69 on your exploded
top view (top right side as viewed from the front).

There are typically only three (3) elements to a DEFROST
circuit:
- Defrost Timer (as noted above)

- Heater element to WARM the EVAPORATOR

- DEFROST thermostat... inhibit excess heat
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Check your defrost pan...
there should be water there DAILY...

IF not: you are assured that your DEFROST fails.

Per YOUR DESCRIPTION...
You need to look for a SUDDEN REASON (huge air leak)
why FROST would form so quickly...
USUALLY a big pizza box... BUT ANYTHING blocking a
TIGHT DOOR SEAL will cause massive frosting.

It is taking moisture from the WARM ROOM AIR and blocking your evaporator...

Yes ... all INTERIOR panels must be in place for the refrigerator to function properly.

guaranteedparts.com http://www.guaranteedparts.com/picture_library/Subzero/Subzero-500%20Series/590.pdf

Sears
http://www.searspartsdirect.com/refrigerator-repair/symptom/REF0003.html

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1 Answer

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