I have a Heil-quaker gas furnance model #NVLKO8OAGO2, the fan motor runs constantly, does not shut off after reaching temperature, and does not shut off if I turn off the fan switch on the wall thermostat to off. Any help would be great. Thanks
Stuck fan relay. If there is no heat or cooling working while on call meaning as soon as you turn it on to either heat or cool only the fan blows than a limit switch or a roll out switch has been tripped.