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HomeRepair HelpTrane Furnace RepairTrane Furnace burners won't stay lit Repair
Trane Furnace burners won't stay lit
01 - 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. Low gas pressure can cause a weak flames and inconsistant lighting.
Highly Likely
02 - Trane Furnace Control Board
The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the ignition system, preventing the burner from staying lit.
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Highly Likely
03 - Clogged or Restricted Vent Pipe or Heat Exchanger
If the flame rollout limit switch is tripping a restricted or cracked heat exchanger, or restricted outlet pipe, could be preventing the flame from being drawn through the heat exchanger properly. This can be very dangerous and the furnace should be inspected by a qualified service technician. You should never keep resetting the rollout limit without fixing the problem. If the heat exchanger is cracked, carbon monoxide can enter the home's venting system causing death. It is recommended to have at least one carbon monoxide detector on each floor of the home.
Highly Likely
04 - Trane 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 burners won't stay lit. 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
05 - 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.
Common
06 - Trane 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 resulting in the burners not staying lit. 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 burners still won't stay lit, replace the flame sensor.
Common
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