Why is my heat not blowing warm air?
Why is my heat not blowing warm air? First, check to make sure the thermostat is set correctly. You will want to make sure that the fan control is set to auto, and not 'on'. If the thermostat appears set correctly, turn off your heater at the thermostat and check the filter. If the filter is dirty, replace it. Why Is My RV heater blowing cold air? βOne common reason for the furnace blowing cold air is low battery voltage. Unlike a residential furnace, in which the blower doesn't start until the plenum has warmed up, an RV furnace starts...