Question about Goodman GDS80904BNA Open Flame Heater
5 year old furnace, just bought house 10 months ago. Furnace worked worked great for first 2 months, then went out. Professional service changed circuit board and checked whole unit over ($800.00). Passed everything ok. Furnace will turn on ok and heat ok. Will only shut off for a mintue or 2 and turn cycle back on again. Thermostat has not even dropped 1 degree. Changed thermostat with high $ Honeywell not trying to be cheap. Problem didn't change. Furnace company has been back 3 times for $120.00 each to tell me ducts and cold air returns need rerouting. I explained that the furnace worked GREAT and CYCLED PROPERLY for first 2 months but nobody is listening. I am master certified auto tech and have diagnostic capabilities! Willing to pay pro to fix, what advise can I give them?
Sounds like your repair man ripped you off. He should have stood behind his work.
1. I would try to clean the flame sensor located just below the burners. It is connected to "one" wire (Not the two wire) clean rod with sandpaper.
2. The old and thermostat could have a had a bad heat anticipator. if the new t/stat is not digital the heat anticpator on the T/stat needs to be adjusted. slide the small adjuster arm under the cover to about .6 or .7 and see if the solves the problem. if the t/stat is digital it should be preset from the factory.
3. last resort have a service man check your pressure swith. could be a slow inducer motor, blocked or bad vacum line, or a restricted drain or flue pipe.
Posted on Mar 08, 2009
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Posted on Jan 02, 2017
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