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Hi. Pool owner for 10 years, plus as a kid my parents had a pool for 12 years and I often helped with maintenance. Current pool is 18x36 with walk in stairs, 42" shallow and 8' deep end (sloped), diving board. Sand filter, Pentair Mastertemp NG heater.

Hi. When my Pentair Mastertemp 250 goes to light, the gas valve opens then if it doesn't light right away BANG!! a backfire out the exhaust. Then it will cycle again and light normally about 5 seconds later. Does NOT set any error codes. This is usually only the first light of the day, maybe a...