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Furnace not starting all the time

The furnace dosent always start, the gas valve has been replaced but still occasionaly locks out

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Either you have a loose wire connection from control board to valve, or your flame sensor is bad.

Posted on Dec 05, 2008

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How do i fix a forced air gas furnace?


Are you sure your thermostat is working. I would try to manually start it by bypassing the thermostat. Possibly bad valve then. That is unless it is opening and the jets are clogged. How old is the unit? Is it an electronic igniter or pilot light. I know you said you changed the mother board but start with step one again. Do I have gas to the unit? I know it sounds crazy but most of the time I found something so obvious I overlooked it. If everything is good I'd look at that thermostat though.

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Have a Fridgidaire GR6C-080C-16 furnace that runs for a few minutes then gas supply is cut-off. Furnace will then re-start and the run through it's pre-cycle, just as if the thermostat just called for...


It sounds to me like you have problems with the gas valve as you have eliminated pretty much everything else. I would check all wiring to valve,check for any breaks on the insulation and clean all connections.
When the burner goes out is the blower still running or does it quit then the burner go off? If that is the case I would think the thermal overload on motor was tripping. It makes me more inclined to suspect the gas valve due to the lack of any diagnostic code.
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Check the ground wire to the gas valve or the wire in the middle of the gas valve that says mv--pv, and that is a ground..

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
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