I have a coleman gas furnace model dgat056bdf-- I got a flashing code for reverse polarity-reset panel- glow plug came on and soon as the burner came on it went back off with reverse polarity code. Remove burner assembly and cleaned flame sensor ,now unit will run for a day or so and go back off with the reverse polarity alarm. Any suggestings on what would cause this? Thanks

I have a coleman gas furnace model dgat056bdf-- I got a flashing code for reverse polarity-reset panel- glow plug came on and soon as the burner came on it went back off with reverse polarity code. Remove burner assembly and cleaned flame sensor ,now unit will run for a day or so and go back off with the reverse polarity alarm. any suggestings on what would cause this? Thanks

If possible reverse the 24 volt feed from the low voltage transformer to the circuit board and see if that helps your situation.

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Originally Posted by hvac1000

I have a coleman gas furnace model dgat056bdf-- I got a flashing code for reverse polarity-reset panel- glow plug came on and soon as the burner came on it went back off with reverse polarity code. Remove burner assembly and cleaned flame sensor ,now unit will run for a day or so and go back off with the reverse polarity alarm. any suggestings on what would cause this? Thanks

If possible reverse the 24 volt feed from the low voltage transformer to the circuit board and see if that helps your situation.

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Thanks for the info will change wiring