Question about Refrigerators
Have looked at the schematics for this cabinet and am unsure as to the location of both defrost thermostats as unclear on drawings. The purpose of the defrost thermostat is to overide the heater and end the defrost cycle, once the temperature on the evaporator is high enough (normally around 0'C). If you have two then one will probably control the heaters going off and the other may well control the fan, for coming back on. I.E. once the defrost has ended the second sensor will tell the fan when the coil is cold enough to come on, this prevents heat being pushed into the main area after a defrost cycle. If you feel competent enough then I would bypass the heater thermostat temporarily and see if the heaters kick in. The other thing to check is that you have a resistance across the two ends of the defrost heater. In my experience the heater is the most likely to fail, the sensor sometimes fail and the timers rarely fail. The age of your cabinet would suggest the heaters. Please do not leave the sensor bypassed as it performs an essential role. Hope this helps.
Posted on Sep 05, 2007
SOURCE: defrost timer
this uses a adaptive defrost board its located in the fridge
compartment in the back left side remove the cover and you'll see the
adaptive defrost board if you have any questions don't hesitate to
e-mail me @ firstname.lastname@example.org
here's an URL of the diagram (copy paste link to your browser)
Posted on Aug 02, 2008
You might want to check and make sure the interior fan is working above the evaporator coils. If the fan isn't working the air won't circulate over the evaporator and it will frost over very quickly, and also cold air won't be pushed into the fridge side.
The fan might turn off when the door is open, hold the door switch shut while you check it.
Posted on Apr 27, 2009
twist your defrost timer with a screwdriver clocwise till it will click and compressor shut off, check voltage on defrost heater. You should have 120volts.When wait 20 min if compressor start up back and defrost heater is off ...your timer is fine. It can come on early then 20 min....
P.S. defrost heater located on the bottom of the coil, also make sure your defrost thermostat is frozen when you going to check voltage on your heater. Thermostat located on the top of your coil.
Posted on Aug 23, 2009
The defrost control on that model could well have failed. If it failed in the defrost mode, then the compressor and condenser fan motor would not run.
The timer is easy enough to remove. Take it to any appliance parts house. A good counter man if you explain the machine is not running could check the contacts that run the compressor.
If it's noisy I would replace it anyway.
If they can't cross the timer, just ask for a replacement with a timing sequence of 8 hours-30 minutes. That means it will run the machine for 8 hours, then shut it off, and defrost it for 30 minutes.
The other possibility is the cold control (thermostat which is located in the fresh food compartment.
That cold control is expensive and labor intensive to replace.
Buy it only if necessary.
However, both items are popular replacement items on your machine.
Posted on Dec 21, 2009
Testimonial: "Thanks for the advice. I tested the defrost control and it is working. I believe it is the thermostat!"
Tips for a great answer:
Mar 19, 2014 | Sub-Zero 650 / O Bottom Freezer...
You have a defrost timer behind the front kick plate turn
it clockwise slowly until compressor and fans stop. Once this happens the timer
should remain off for 30 minutes and the defrost heater should come on during
the first 15 minutes. If after 30 minutes the defrost timer part=> 215846602 Defrost Timer Assembly
should come out of defrost and the compressor and fans should restart, if not
advance the timer clockwise until they start and replace timer. Try that first
and tell me what your results are. If that is not the problem then we can
narrow this down to the defrost heater=> 218657301 Defrost Heater
or 5303917954 Defrost Thermostat How to test the defrost heater is
found on same page as the defrost heater. If you have any questions I will be
here to help you, Thanks Sea
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