Hello, I've got a Goodman GDT090-4 furnace. I'm having trouble keeping it lit. If I just turn itty on it might light and run for a few seconds and then turn off. Sometimes I get a 4 blink error for main/aux limit open. If a manually turn the fan on at the thermostat it will run and only occasionally turn of but then relights. I've cleaned out the blower housing and blew air through the burner to clear out any possible debris. I also put a new filter on it. My guess is the B13701-94 switch is bad. Is there somewhere else I should look?
Goodman furnace flaming out
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Is the blower starting? Or is it actually overheating due to no airflow?
The exhaust blower is turning on. The temp sensor was replaced a few months ago. If I manually turn the vent fan on it will basically work.
Not the inducer, the blower motor.
Yes the blower is turning on.
Is the limit opening immediately? Or is it actually overheating and opening?
A opening limit is usually opening for a reason. Usually it's due to poor airflow. This could be because of a plugged up air filter, dirty air conditioner coil, dirty secondary heat exchanger coil, too many supply registers closed, supply or return registers blocked by furniture or other things, and/or an oversized furnace hooked up to undersized duct work.
If all of those check out, then the next most likely cause would be a bad heat exchanger.
The 3rd most likely cause would be gas pressure that's too high.
As far as things you can do as a home owner, check to make sure the filter is clean and not a "Filtrete" or similar kind that is too restrictive. Perhaps try a cheap spun fiberglass kind as a test to see if that helps. Also make sure all of your supply and return vents throughout your home are open.
If those 2 things don't help, it usually means it's time to call in a pro.
If the pro determines that you need a new furnace, strongly consider going down a size or 2. This is because most furnaces that are out in the world tend to be over-sized. Contrary to how most people think, a smaller furnace usually works a lot better, is quieter, more efficient, more comfortable, and longer lasting. If you can find a company to run a proper "manual J" load calculation to determine the actual size that you need that's even better.
Good luck!
If all of those check out, then the next most likely cause would be a bad heat exchanger.
The 3rd most likely cause would be gas pressure that's too high.
As far as things you can do as a home owner, check to make sure the filter is clean and not a "Filtrete" or similar kind that is too restrictive. Perhaps try a cheap spun fiberglass kind as a test to see if that helps. Also make sure all of your supply and return vents throughout your home are open.
If those 2 things don't help, it usually means it's time to call in a pro.
If the pro determines that you need a new furnace, strongly consider going down a size or 2. This is because most furnaces that are out in the world tend to be over-sized. Contrary to how most people think, a smaller furnace usually works a lot better, is quieter, more efficient, more comfortable, and longer lasting. If you can find a company to run a proper "manual J" load calculation to determine the actual size that you need that's even better.
Good luck!
1 - 7 of 7 Posts
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