OK so you replaced the Thermostat huh? OK well then did you also replace the Thermistor Temperature Sensor? or whatever is used? As often it's BOTH, also check the wiring from the sensor to the host, in any event if it's NOT that then all it can be is the controller board, most likely the Micro? Check any and all sensors first though.. try to get a service manual too, it's hard without one?
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OK so you replaced the Thermostat huh? OK well then did you also replace the Thermistor Temperature Sensor? or whatever is used? As often it's BOTH, also check the wiring from the sensor to the host, in any event if it's NOT that then all it can be is the controller board, most likely the Micro? Check any and all sensors first though.. try to get a service manual too, it's hard without one?