Have a customer phoned with a Hotpoint WT741 thermistor error. It looks like you can only get quite an expensive heater / therm together on this model (and could be the pcb) Anyone tried chopping the silly plug off and fitting a wma style thermistor; Are the thermistors the same values?
Worth checking the connections on the module squeeze the plug gently with a pair of pliers and clean the contacts. I think it is unlikely to be the thermister.