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ginavarat

SubZero 501R Not Holding Temperature

7 posts in this topic

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.

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Need appliance parts? Call 877-803-7957 now!

Don't do much work on sub zeros but may be a thermostat no cycling correctly.

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Sounds like a SZ 532 I worked on recently, same erratic temperature control problem, even with a new cold control.

 

gallery_4_24_7977.png

 

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.  

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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? 

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There's a fan inside the compartment that should be running when the compressor is running.  You can also open the door and press in the fan switch to hear it run.  

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No fan is running when the switch is pushed in. 

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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.org/files/file/160-sub-zero-500-series-refrigerator-technical-service-manual/

 

You'll need to upgrade your membership to download it:  http://apprentice.appliantology.org/

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