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There are two lights. When the furnace is not running there is a red light that blinks. It will blink 4 times and then pause and blink 4 times and pause. When the furnace is running, there is a...

Buy a new can.

The furnace is gas with an electronic ignition wire - doesn't have a pilot light. They worked on it before and I believe the guy said it was the ignitor or ignition switch wire.

Gibson Furnace will blow cold air sometimes instead of warm air. I believe it to be a problem with a wire because we had it worked on before. There are also two lights - one stays on continuously...