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How to diagnos burner won't light when pilot light on?

The pilot light will stay on, but the burner will not come on when the control knob is turned to on position

Eddie
October 2011
Heating, Home Heating SystemsLight Control Turned
replace high level stat. replace gas reg valve .

killerdanny
October 2011
Also fault in high limit term start before gas valve if no signal or power to on off to term start gas vale will not open

Ltd
October 2011
Gas valve is at fault change gas valve

Ltd
October 2011

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Burner Wont Light - Pilot On: Troubleshooting