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Hi my name is Robert.....
IF the controls are flashing 4 times and repeating the circuit board has failed, the circuit board will be located under the outside access panel, the only other thing I might try is to hook up 12 volts directly to the fridge and see if the code goes away. Sometimes a power converter can put out AC ripple or dirty voltage and the board does not like it. Click HERE for a service manual on this, you can see that the code indicates a board failure... Hope this helps... Robert