Article ID: 602
Last updated: 7 Mar, 2019
York 90% Gas Furnace: P*MPD Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has a single pressure switch which monitors for proper venting.
CHECKOUT: 1. Check Control Board
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Article ID: 602
Last updated: 7 Mar, 2019
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