The Miele Fridge Freezer KFN8462S which flashed F2 intermittently and for which I was advised to replace the temperature sensor is again registering the same fault warning 6 days after I changed the sensor for a new one. I have noticed that on the back wall of the fridge ice has formed blocking the drain hole. I defrosted this and cleared the drain but again the fault is intermittently flashing. The freezer is set to -18 and the fridge set to 3
Refrigerators - Miele - KFN8462S Bottom Freezer Refrigerator
Answers & Comments
Hi.
F2 indicates that there is a defrost problem. For this reason, if you turn off and defrost the fridge manually, the unit will work for a while after doing defrost.
You said that you replaced temperature sensor. What is called temperature sensor is different from the defrost thermostat, which is one of the parts involved in the fault.
If there is no defrost cycle, or if defrost is insufficient, problem is usually the defrost thermostat. The thermostat is located behind the freezer section rear wall, where the evaporator resides. To access it you need to remove frozen food and undo screws holding the back panel. The thermostat is a metal cylinder shaped object connected to two wires and clipped to the evaporator. The thermostat can be tested using a multimeter set on impedance. If reading impedance at room temp. on the thermostat contacts is infinity (circuit open),then the thermostat must be replaced. In the same way is tested the defrost heater. Check also that evaporator fan is starting.
If parts in the evaporator section are working, then the problem can be the defrost timer, which starts the defrost once every 8 hours.
Here how thermostat looks like. In same page read also the repair instructions from other users.
Regards.
Ginko.