Hello all, GMP power vented gas furnace won't ignite-blower is blowing cold air-indicator light is flashing 4 times...

Check service label for translation of LED fault code and post here. Look inside blower access panel. Continuous blower operation usually indicates an open limit device.

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Originally Posted by KC13

Check service label for translation of LED fault code and post here. Look inside blower access panel. Continuous blower operation usually indicates an open limit device.

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Does this mean that a limit switch needs to be replaced?

Maybe. But it may be as simple as pushing a button on a flame rollout. Have you checked filters lately. There is most likely a reason for limit malfunction

The OP didn't state that the blower was running constantly, just that it was blowing cold. Could just be an ignition failure. Flame sensor perhaps. Need more information to accurately diagnose.

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Originally Posted by mygirlsdad77

maybe. but it may be as simple as pushing a button on a flame rollout. Have you checked filters lately. There is most likely a reason for limit malfunction

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I actually changed air filter about an hour before we noticed no heat coming out just continuous cold air-blower running non stop

Just waiting to hear what the code means. You should be able to find it on inside furnace cover or in furnace manual.

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Originally Posted by rebelsinjin

I actually changed air filter about an hour before we noticed no heat coming out just continous cold air-blower running non stop

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Was the heat working before you changed the filter?

Your thermostat isn't set on "run" instead of "auto" is it.

Just had to ask

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Originally Posted by cyberheater

Your thermostat isn't set on "run" instead of "auto" is it.

Just had to ask

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You mean "ON" not "RUN"