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Carrier Furnace won't start up

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Sequence of events: call for heat at T-stat, inducer motor turns on, negative pressure created in heat exchanger closes pressure switch, pressure switch control wire runs through all safety's (these must all be in closed/safe position) if ok then glow plug lights. Time delay then gas valve opens, flame verified by "flame rod" t-stat = :)

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

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see this causes and fix it. God bless you
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