What's Wrong When Your Furnace Blows Cold Air - Web when the thermostat is turned on, a pilot light or electronic igniter lights the fuel in a combustion chamber, which begins to. The first place to check when your furnace is blowing cold air is the thermostat. Web so what seems to be a faulty furnace blowing out cold air is, in fact, a thermostat fan setting that increases your. Web if your furnace is blowing cold air, there is a possibility that the thermostat is sending the message to turn on the blower motor, but.
Web so what seems to be a faulty furnace blowing out cold air is, in fact, a thermostat fan setting that increases your. Web if your furnace is blowing cold air, there is a possibility that the thermostat is sending the message to turn on the blower motor, but. Web when the thermostat is turned on, a pilot light or electronic igniter lights the fuel in a combustion chamber, which begins to. The first place to check when your furnace is blowing cold air is the thermostat.