Question about Goodman GMS90703BXA Heater

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I have a Goodman GMS9 Furnace that ignites and runs perfect for about 5minutes and then I will here a woosh of air and the flame goes out and inducer motor stops for about 3 seconds, then it re-lites and runs good for about 30seconds and kicks backoff, then relites again and runs for 30secs and so on..... I had a HVAC person look at it and he cleaned the flame sensor, blew out the exhaust and intake tubes, checked the condensate trap, and changed the pressure switch thinking that would fix it. It is still doing the same thing?

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Hello,
This is a common problem with this brand and can even often fool HVAC contractors! There is a control module/circuit board inside the furnace that needs to be replaced for proper operation. The circuit board controls multiple functions and switches and relays inside the equipment and it begins developing a mind of it's own and starts turning certain things on and off at improper sequences. Most of Goodmans furnaces come with a 10 year parts warranty, so try exhausting that resource first before buying one.
Hope this helps James

Posted on Apr 06, 2011

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Replacing the board, flame sensor, and pressure switch, and cleaning out the induction motor was definitely a good start. Other things to check would be a blocked or restricted flue pipe, I have ran into a few bird nest before!, and you also want to check or replace the hose that runs from the inducer to the pressure switch if you haven't already. To be honest, most of the time I clear out the nipple on the inducer where the hose goes with a small piece of wire and it works. The last thing I would suggest is making sure the new pressure switch is rated for what you need. Alot of the revisions on furnaces actually call for less than the original pressure just for this problem. Hope this helps and good luck!

Feb 15, 2011 | Goodman GMS90703BXA Heater

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My goodman furnace keeps lighting for about 10 seconds than goes out lots of clicking sounds


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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 igniter. I would suggest that you inspect your igniter closely for cracks. Make sure you do not touch the igniter with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, roll-out 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.

NATE, NCCER, PHCC,HVAC Certified Instructor

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Furnace won't stay running


1
1 FLASH
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to an excessive
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interruption.
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contact operation).
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igniter.
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signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
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draft blower performance.

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