Plumbing Questions? Ask a Plumbing Expert.
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What is the model number of the heater? If it won't start it should flash a sequence (several flashes a pause then repeat) Can you give me a picture of the gas valve?
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Ok, so what about the flash sequence? A steady fast flash is a call for heat/normal operation. Does the fan run?
Do you have a multi-meter?
Well, you need a meter to troubleshoot this further. You need to test the voltage at various points in the control circuit. It could be as simple as a bad switch or as expensive as a bad gas control valve.
You're welcome. Do you have any more questions?