I have a Hotpoint Fridge Freezer (RF68S). It is a basic fridge/freezer (not frost free). The red warning light for the freezer temperature started to come on sporadically a couple of weeks ago and has deteriorated to the point that the light is on constantly. The temperature varies through the day between -3degC and -11degC. The compressor is switching on but not staying on for long (5-10 minutes). I've tried to check the operation of the thermostat and by having it set on full cold (for the fridge) the compressor stays running - the freezer temperature drops slowly (I've not left it long enough yet to see if the freezer manages to return to its correct temperature). If I turn down the dial (demand a warmer temp) for the fridge the compressor stops - should it do this if the freezer has still not reached its correct operating temperature? Is this an indication that the thermostat has partially failed (perhaps for the freezer but not the fridge control)? Additionally - the freezer is coldest at the top but the top has the largest number of heat exchanger plates/coils vs the bottom.