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Hello, I need the brand name of the water heater or furnace and its model number.... or a photo of the units wiring diagram glued to the inside of the blower service panel if its a furnace.
I need the brand name and model number on the gas valve as well, I also need to know if there is a knob or lever on marked ON-OFF-Pilot or not.
So far it sounds like a bad thermocouple or flame sensor problem, an easy fix in most cases.