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Burnham ASPEN

DaleW Member Posts: 6
I have a customer with a aspen 155. installed 2 years ago. The unit backfires on start up flame comes back out air tube. The unit sometimes stays one after start up and runs fin until it starts to throttle back , starts popping again around 55 % firing rate. have to shut off unit. Has anyone had these problems? gas incoming is at 8.5 inches natural.