Question about Heating & Cooling
If it is an electric furnace, the heat sequencers usually take 45 seconds to possibly 1 1/2 minutes to fully stage on. This depends on how many elements you have. Of course, once they stage on, one or more elements COULD be burnt out.
If its a gas furnace over ten/twelve years old, the thermally activated control should start the blower at approximately 140 degrees. That usually occurs within one or two minutes of main gas opening.
If its a gas furnace that's relatively new, the blower comes on through a circuit board after a call for heat is initiated and could run and blow cold air even if the main gas flame is in flame failure.
Posted on Nov 26, 2014
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Posted on Jan 02, 2017
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