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Billy
Billy, HVAC Technician
Category: HVAC
Satisfied Customers: 19703
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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furnace ignites and runs for a short time then burner shuts

Customer Question

furnace ignites and runs for a short time then burner shuts off. no codes
Submitted: 2 years ago.
Category: HVAC
Expert:  mranswer replied 2 years ago.
The gas valve may be faulty here- you'll need a voltmeter to see if the valve has power to it when the flame fails as it should be passing gas whenever it is energized. This is the first thing I would check and then move on to the next step if that is not it.
Customer: replied 2 years ago.
Relist: Answer quality.
Expert:  Billy replied 2 years ago.
Hello,

If no codes then it is one of 2 things...

either the thermostat is turning power off to the W connection at circuit board..

Or the circuit board is bad.

A fault with the gas valve would result in a code.

To test...remove the thermostat and take the wire from R and the wire from W and twist together. If furnace runs without stopping replace thermostat.

If the furnace faults with blink code then it is bad circuit board.

Billy

Customer: replied 2 years ago.
same problem
Expert:  Billy replied 2 years ago.
Could you be more specific...

Do you mean with R and W jumped the furnace still faults and the light never blinks?

Customer: replied 2 years ago.
yes the ingniter still comes on ,ingnites furnace,but when ingniter ic cooling off the flame shut off this cycle repeats
Expert:  Billy replied 2 years ago.

Have you let it cyle through 3 times until it shuts itself down?

Have you cleaned the flame sense rod with steel wool?

Customer: replied 2 years ago.

thanks cleaned flame sense rod and furnacre runs correct

Expert:  Billy replied 2 years ago.
Excellent. Thanks for your patience.

Billy

Billy, HVAC Technician
Category: HVAC
Satisfied Customers: 19703
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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