Real Plumbing Help Plumbing and Heating Answers

The gas control valve on a standing pilot gas boiler or furnace.

The gas valve or gas control valve, how to test to see if this is the reason that you have a pilot light, but the boiler will not fire. IF this is a 24 volt gas valve (some are 120 volts and some are (milivolt) simply test the 2 wires that go to the gas valve, if you have 24 volts and the pilot is lit and the knob is in the on position, chances are the natural or LP gas valve is defective. The gas valve or gas control valve, how to test to see if this is the reason that you have a pilot light, but the boiler will not fire. IF this is a 24 volt gas valve (some are 120 volts and some are (milivolt) simply test the 2 wires that go to the gas valve, if you have 24 volts and the pilot is lit and the knob is in the on position, chances are the natural or LP gas valve is defective.  

Call a professional to check your diagnosis and to replace the gas valve. I do not give instructions on how to replace a gas valve because it is very dangerous and the new gas valve needs to be set up with special instruments. If you do NOT have 24 volts at the gas valve, the gas valve it probably not the problem.Call a professional to check your diagnosis and to replace the gas valve. I do not give instructions on how to replace a gas valve because it is very dangerous and the new gas valve needs to be set up with special instruments. If you do NOT have 24 volts at the gas valve, the gas valve it probably not the problem.

Please do not for any reason bypass anything on your boiler even just for testing purposes. Please do not run a straight 24 volt power source to the gas valve just to see if it will fire.

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