Question about Weather King 10AJA3601AH Air Conditioner
Then the igniter lights then the gas valve opens . now this is where it really becomes technical the flame ignites for approx 15 sec and goes out. thought flame sensor or circuit board replaced both of them and it still does the same thing. also checked the wiring connections through all the plugs. I am an experienced hvac tech but am lost here anyone have any advice
My furnace did the same and I found a small crack in the hose going from the exaust fan to a presure switch. I cut the bad piece out and started working fine.
Posted on Dec 15, 2008
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Posted on Jan 02, 2017
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Feb 15, 2011 | Weather King Heating & Cooling
Jan 08, 2011 | Heating & Cooling
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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