Thermostat Not Working
Thermostat Not Working THERMOSTAT BLANK or THERMOSTAT DOESN’T WORK– The display on a digital thermostat shows no information or the thermostat does not function properly. POSSIBLE PROBLEM & DESCRIPTION Bad Batteries Most digital thermostats require batteries. Try replacing the thermostat batteries and see if the display returns. Watch Video. Loss of Power to the Furnace Low voltage power […]
Thermostat Blank
Thermostat Blank THERMOSTAT BLANK or THERMOSTAT DOESN’T WORK– The display on a digital thermostat shows no information or the thermostat does not function properly. POSSIBLE PROBLEM & DESCRIPTION Bad Batteries Most digital thermostats require batteries. Try replacing the thermostat batteries and see if the display returns. Watch Video. Loss of Power to the Furnace Low voltage power for […]
Odor
Odor ODOR – On a unusual smell coming from the furnace or ductwork. POSSIBLE PROBLEM & DESCRIPTION Seasonal Start-Up It is normal to have a burning smell (and sometimes even a small amount of smoke) from the furnace the first time that it comes on in cold weather. This is the result of heating the dust […]
Noise
Noise NOISE – An unusual sound is coming from the furnace. POSSIBLE PROBLEM & DESCRIPTION Loose Belt Some older furnaces use a belt-drive motor and blower system. When the belt becomes loose it can generate a squeaking or squealing noise (especially on start-up). A damaged belt may cause a thumping noise. Bad Blower Bearings – Qualified […]
Pilot Out
Pilot Out PILOT OUT – On a “standing-pilot” furnace, the pilot light is not burning and the furnace will not come on. POSSIBLE PROBLEM & DESCRIPTION Bad Thermocouple Many older gas furnaces utilize a “standing pilot” (a small pilot flame that burns continuous inside the burner compartment). Standing pilot furnaces require a thermocouple to ensure that […]
Burners Won’t Stay Lit
Burners Won’t Stay Lit BURNERS DON’T STAY LIT – The furnace burners fire, but go off before the thermostat temperature is satisfied. https://www.youtube.com/watch?v=TH24B-WdsAo POSSIBLE PROBLEM & DESCRIPTION Dirty Flame Sensor – Qualified Technician Recommended After a gas furnace opens the gas valve to allow gas into the combustion chamber, the furnace control board will monitor for […]
Fan Doesn’t Run
Fan Doesn’t Run FAN DOESN’T RUN – The furnace fires, but the blower does not start. After the burners have ignited, the next step in the heating cycle is starting of the blower motor. This will be done either by a heat-activated switch or internal timing of a control board. In either instance, the blower motor […]
Fan Runs Continuous
Fan Runs Continuous FAN RUNS CONTINUOUS – The thermostat maintains the correct temperature, but the indoor fan never quits blowing. POSSIBLE PROBLEM & DESCRIPTION Thermostat “Fan” Switch The most common cause of this problem is the “Fan” switch on the thermostat. It normally has two options – “Auto” and “On”. In the “Auto” position, the fan […]
Runs Too Much
Runs Too Much RUNS TOO MUCH & LOW HEAT – The gas furnace seems to run too long or the furnace kicks on too often. May be the result of a periodic safety shutdown that causes the furnace to stop burning during a heating cycle. This is often accompanied by a higher-than-normal gas bill and inadequate […]
Sometimes Doesn’t Heat
Sometimes Doesn’t Heat FURNACE SOMETIMES DOESN’T HEAT – In this situation, a gas furnace will heat most of the time, but every once in a while will stop operating. There are several issues that can cause this – most require the services of a qualified service technician. This situation is often caused by a furnace control […]