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F20 means that there is a problem with the defrost system. The temperature sensor and the element comprised in the defrost system must be tested. Testing is done removing the firewall panel (usually in the freezer compartment in F&P) and accessing the parts. Parts are tested reading impedance with a multimeter. The test will determine if element is open or if the temperature sensor is open at room temperature to find out if any of the two parts must be replaced. Voltage to element must also be tested.Try performing a manual defrost. Remove all food and disconnect the fridge overnight. If the problem does not come back, then the fault was probably a temporary malfunction. If the defrost system is faulty the problem may come back after a couple of days, when the defrost system restart malfunctioning.
Well if you are wanting someone to come out then you will need to contact F&P but if you are trying to figure this out and repair it with my assistance online I can do that with you.
I wanted to check in with you to see how everything was going? I wanted to see if you needed any further assistance.