My heater kicks on, pilot ignites and fan turns on, however all of a sudden the gas lines go out and everything ignites again. This process keeps repeating over and over. The module is operational, the thermostat is working and the blocked vent switch is new.Any ideas would be helpful.
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Find where the gas line connects to the gas valve on the back of the heater, from the gas valve, follow a small aluminum tube going into the back of the heater. There may be a removable door to access the pilot assembly. If there is no aluminum tube, the unit has electronic ignition and no pilot lite. Turn the gas knob to off, then to pilot. Hold the gas valve in and with a long match or gas grill lighter, light the pilot. Continue to hold the knob in for about 30 seconds. After that, release the knob and check to make sure the pilot stays lit. If so, rotate the knob to ON. The thermostat will kick the burners on.
if you can use a meter check for 24 volts at the valve when you call for heat. If you have 24 volts and no burners then the valve is bad, if you do not have 24 volts then another safety is locking out the valve
Does the main blower fan kick on? Also, if the heater is vented outside via a flue pipe, there may be a small (about 3 or 4 inches in diameter) vent fan that kicks on to ensure the exhaust fumes are evacuated through the flue pipe. If there's a problem with that fan, the burner won't light either.