Keep pushing the temp buttons, they'll cycle through to as low as it will go, back to the highest temp setting. From 2 repair bills I've had, suggest you leave them on the factory defaults. Simply unplugging for a minute, then plugging back up should restore to factory setting.
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I have the same problem with this refrigerator. It looks like Sears Parts Direct sells all the parts for this unit except for the printed circuit board and temperature control switches. I called my local repairman and set up an appointment. He called back to cancel his appointment because he was also unable to get the electronics. Were you able to fix your unit? What did you replace?
The Er Co error code signifies a communication error between the display control board on the freezer door and the main power board on the outer back panel of the refrigerator.
Check the wiring and connections between the low voltage interface and the main high voltage board.
If you are able to unplug the refrigerator and remove the cover over the control board on the back of the refrigerator, you can check the wiring connection on the main control board.
If this wiring connection is okay, check the wire harness connection under the hinge cover on the top of the left hand refrigerator door. If these connections are okay, then you will need access the wire harness connection in the dispenser.
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Mullion heater is not the problem. If the refrigerator is not cooling look to the freezer compartment for your problem. Air from the freezer is used to cool the refrigerator(s) section. If the freezer coil frosts up it stops air circulation to the rest of the system. Although you may think the freezer is working properly it may have a defrost problem and will show up there also. Look for signs of frost on the back wall of the freezer as a sign of the coil freezing. The mullion heater is designed to put out just enough heat to stop condensation between the outside temperatures and the inner compartmant temperatures. If the inner compartment is warm the heater will seem warmer than normal.
It is the compressor that has failed. The hum is it trying to start and the following click is the overload protector opening. What is the temperature where the refrigerator is located? Allow the compressor to cool down before trying to restart it. If it still does not restart after it has cooled off it is done.