hoover hf39c001

Hello everyone, problem with hoover hf39C001 fridge freezer fan keeps icing up solid, i think it may be the pcb as if we defrost it for a day or two then switch it back on and press the fast free button the interior light comes on and wont turn off even if you close the door or defeat the switch, any food under the lamp warms up over time, you have to unplug the fridge then plug it back in, the fan freezes up again over the next few days, any ideas gratefully received :)

need to check the temp sensor and heater element

hi tonto, yes will do, but not sure why the interior light comes on when you press the fast freeze button on the front, strange as it just seems to stay on and the heat under/off the lamp warms food, melts butter etc