I've got a Fraser-Johnston model PACE-LD14N100A propane furnace. When I turn on the heat, the blower starts immediately instead of the usual ignition sequence. The igniter never heats, no propane goes to the burners - just the blower chugging away at circulating unheated air through the ductwork for as long as I leave it on.

Visual inspection of the igniter reveals no apparent damage. I've replaced the flame sensor, but to no effect.

I would be grateful for any advice!

Thanks!

Sounds like a limit problem. Check the limit switch operation first. Also could be the 50e 47 control board they tend to go bad often.

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Originally Posted by Joshdta

sounds like a limit problem. check the limit switch operation first. also could be the 50e 47 control board they tend to go bad often.

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Thanks! I'll put an ohmmeter across the limit switches to check.