Question about Goodman Heating & Cooling
First we need to understand what is probably happening by understanding how this unit works.
A flame safety senses a flame and if one is not present it shuts off the gas supply. This safety is incorporated to make sure that if the flame goes out for any reason, it doesn't continue to dump gas into the furnace. Because I have no idea what type of sensors this unit uses, can you explain to me what kind of ignitor it has? See if it has a spark, or a hot surface ignitor. The hot surface ignitor will glow very bright white but looks like it's made of ceramic.
Posted on Sep 19, 2008
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Posted on Jan 02, 2017
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1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, 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 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. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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