I just bought a new mobile home in the summer the central ac worked great but now when I switch it to heat the hearing element kicks on but it will not fire. It is giving me the 3 flash error code combustion air switch failed to close. Previous owners said to blow out the tubes because of spiders which I did but still nothing. Any other things I could try myself?

I just bought a new mobile home in the summer the central ac worked great but now when I switch it to heat the hearing element kicks on but it will not fire. It is giving me the 3 flash error code combustion air switch failed to close. Previous owners said to blow out the tubes because of spiders which I did but still nothing. Any other things I could try myself??


Since the unit is new it has a warranty. You do not want to try and fix it yourself since doing so could violate the warranty and cause other problems with the unit. One thing you can check is to make sure your gas supply is operational before the warranty service person shows up to fix your furnace.

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Originally Posted by hvac1000

I just bought a new mobile home in the summer the central ac worked great but now when I switch it to heat the hearing element kicks on but it will not fire. It is giving me the 3 flash error code combustion air switch failed to close. Previous owners said to blow out the tubes because of spiders which I did but still nothing. Any other things I could try myself??


Since the unit is new it has a warranty. You do not want to try and fix it yourself since doing so could violate the warranty and cause other problems with the unit. One thing you can check is to make sure your gas supply is operational before the warranty service person shows up to fix your furnace.

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It's not a brand new home(new to me) I replaced the air flow sensor and that didn't work either.