White Rodgers 1F89-0211 Thermostat

My thermostat is set at 74 but in like a hour the temperature on the thermostat has risen to 88 but the thermostat is still set at 74 it gets so hot its unbearable what wrong with the thermostat

It could be the thermostat or something else like wiring, system controls etc. We suggest you have someone check it out since it is hard to pinpoint what the problem is without being there and checking the whole system. Thanks.