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Ruud IFC Furnace Blower comes on and stays running, never lites

Blower comes on and stays running and never tries to lite. Turned off the thermostat and now have it disconnected and as soon as power is restored to the furnance the blower starts running and never shuts off.

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Check on the circuit board for an automotive type fuse that is probably blown. These fuses blow because of a short in the control wiring. If the fuse is blown a lot of furnaces run the fan all the time as a diagnostic. You will have to find the short or it will just blow again.

Posted on Oct 05, 2009

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