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Identify Problem
03
Find Solutions
01 - Furnace Igniter
The igniter gets very hot and glows bright orange to light the gas burner. If the igniter fails or cracks, the furnace won’t heat. To determine if the igniter is faulty, remove the igniter and inspect it for cracks. If the igniter is cracked, replace it. If the igniter is not cracked, use a multimeter to test the igniter for continuity. If the igniter does not have continuity, replace it.
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Top Solution
02 - Gas Supply Problem
Check the gas control valve to ensure that it is turned on and there is gas present at the valve. Natural gas pressure should be close to 4 inches water column at the furnace input; propane pressure close to 11 inches water column at the furnace input. The gas pressure can be checked with a manometer at the valve.
Top Solution
03 - Incoming Power Problem
Check to see if there is power to the furnace. One or more indicator lights on the control board should be illuminated. If there is no power to the furnace, check the home's furnace circuit breaker or fuse. Confirm the power switch on the side of the furnace is turned on.
Top Solution
04 - Furnace Flame Sensor
The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.
Highly Likely
05 - Check Fault Codes
If the furnace stops working properly the control board will often display a fault code to help diagnose the problem. The fault codes are displayed by a flashing light or multiple lights on the control board. Each sequence of flashes followed by a pause will indicate either an error code or the status of the furnace. Some manufacturers will use red and green lights to indicate specific fault codes. Fault codes are often displayed on the access cover of the furnace for easy reference.
Highly Likely
06 - Improper Vacuum or Pressure
The draft inducer fan motor assembly creates a vacuum when running which closes the pressure switch. Check the pressure hose and port on the inducer assembly for leaks or obstructions. A clogged condensate trap or drain, or restricted heat exchanger, can also cause a pressure switch to not function. Replace the pressure switch if there is proper vacuum or pressure but the switch is not working properly. You can test the pressure switch for electrical continuity with a multimeter. The contacts will either close or open depending on the application.
Highly Likely
Troubleshooting by Brand
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