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Carrier 48sx gas pack. Won't turn on. No smell. No igniting sound. Blower fan works. How do I troubleshoot this?

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Remove the panel from the heater section, you will need to watch what happends as there is a call for heat. There may be a light on the control board that lights up or blinks to indicate a call for heat. The inducer blower (exhaust blower) will start. INn a few seconds after the blower starts, the igniter will glow orange. After a few more seconds the gas valve should open and the burner will ignite. If the inducer does not run, you may have a bad motor or control board. If the igniter does not glow, you could have a bad pressure switch, bad pressure switch hose or a broken igniter. If the gas valve does not open, you may have a bad control board or bad gas valve. If you get no light on control board, bad fuse, bad thermostat or bad control board.

Posted on Jan 03, 2011

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