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03
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01 - Furnace Limit Switch
The flame rollout limit switch monitors the heat surrounding the burners. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout limit switch will open to halt the ignition sequence and prevent the furnace from heating. When this happens, the furnace will shut off after running for a few minutes. To determine if the flame rollout limit switch is defective, use a multimeter to test it for continuity. If the switch does not have continuity, replace it. Be aware that poor airflow through the burner is often a result of insufficient ventilation or a restricte...
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Top Solution
02 - 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
03 - Furnace Hose
The air traveling through the pressure switch hose will put a negative pressure or vacuum on the switch, causing it to close when the burner has sufficient airflow and allowing the ignition process to continue. If the hose has a hole in it, or is not securely fastened to the switch, the pressure switch may only close intermittently, causing the furnace to start then stop. Inspect the pressure switch hose for any damage and replace if necessary.
Highly Likely
04 - Furnace Tube
The air traveling through the pressure switch tube will put a negative pressure or vacuum on the switch, causing it to close when the burner has sufficient airflow and allowing the ignition process to continue. If the tube has a hole in it, or is not securely fastened to the switch, the pressure switch may only close intermittently, causing the furnace to start then stop. Inspect the pressure switch tube for any damage and replace if necessary.
Highly Likely
05 - Furnace Igniter
The igniter gets very hot and glows bright orange to light the gas burner. If the igniter fails, the gas won't continue to be ignited and the furnace may start then stop. 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.
Common
06 - Furnace Air Filter
Check and replace the furnace air filter at least twice a year, more often in dusty/dirty environments or if there is a pet in the home. A clogged air filter will greatly reduce the air flow of the furnace blower and can cause the furnace to stop working after it cycles on.
Common
07 - Furnace Heat Exchanger
A heat exchanger is used to transfer and separate the heat generated from the burners to the home's air supply. If the heat exchanger develops a crack or becomes clogged, dangerous fumes can mix with the air being circulated throughout the home. For this reason, the furnace shoud be checked annually by a qualfied technician and carbon dioxide detectors should be placed in bedrooms and other frequently-used living areas.
Common