York PM9B12N080UP11A , Flame detection with gas off. Tried to fire the unit after putting a new gas line in and it attempted a few times (ignitor on) . Eventually is got the 1 blink red error code- (flame detection with gas off). I checked the flame rod and it appears fine and is not grounding. Could this be a gas valve issue ? It is a modulating gas valve. It wont attempt to fire now, but inducer motor and blower will run. Any suggestions or opinions would be greatly appreciated.
source https://hvac-talk.com/vbb/showthread.php?2222607-York-PM9B12N080UP11A-Flame-detection-with-gas-off-Will-not-Fire&goto=newpost
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