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pcoplin's avatar
pcoplin
Explorer II
Nov 27, 2015

Atwood furnace blowing cold some time at night...

I have an Atwood 7900 series furnace in my 2001 Lance 915. DSI iginition, no external timer relay. The past couple nights I have woke up to cold to find the heat has shut off and it just blows cold...
3_tons's avatar
3_tons
Explorer III
Nov 28, 2015
Mine had the same problem and after troubleshooting to no avail pulled out the igniter and found that the air gap looked like it had spread too wide, likely due to road borne vibration... I squeezed the gap back to 1/4", reinstalled and it has worked flawlessly for 2yrs now...after the reinstall, I called the Atwood tech line and was told that that was exactly the right fix and that the gap will occasionally get out of its spec width of 1/4".

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