Question about Air Conditioners
This appears to be a sensor problem. Lightly sand the sensor for a good contact with the flame.
Posted on Dec 19, 2008
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1. On a call for heat
2.The draft inducer motor starts.
3.The pressure switch which has a small plastic or rubber tube attached yo it senses the negative pressure produced by the draft inducer and closes.
4.The draft inducer runs for 30 seconds to a minute before you hear the gas making a hissing sound. The ignitor did not glow,therefore the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the gas hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Please Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could possibly have a furnace control board problem or a bad limit switch or rollout switch problem.
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