I have a 22 year old 501R. The temperature will not maintain a constant. It is either 25-30 degrees or 40 degrees. The temperature setting is on "1". If I increase it, everything freezes.
SubZero 501R Not Holding Temperature
Posted 11 November 2013 - 08:45 AM
Sounds like a SZ 532 I worked on recently, same erratic temperature control problem, even with a new cold control.
The problem turned out to be a sealed system leak. The giveaway on temperature graph is the long recovery after defrosts.
I see a sealed system repair in your future.
Posted 21 November 2013 - 01:18 PM
Thanks for your reply. When the door is closed, the only time I hear a fan running is when the fridge is actively cooling. (Condenser fan?) Should there be another fan running when the condenser is not on?
Posted 21 November 2013 - 04:37 PM
May have a bad fan switch or a bad fan motor. Couple ways to test.
One would be to kill power, remove the fan switch, restore power, and then see if you're getting 120vac across the fan switch with the switch open. The voltage should then go away when you press the fan switch.
The other way is to kill power, disassemble to access the evap fan motor and see if you're getting 120vac to the fan motor with the fan switch pressed closed.
The service manual will help with disassembly: http://appliantology...service-manual/
You'll need to upgrade your membership to download it: http://apprentice.appliantology.org/
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