Question about Carrier 38CKC042 Air Conditioner
SA7414 Central Air: put heat on, blower started for about 10 sec. then stopped. No heat.
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Posted on Jan 02, 2017
Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.
Posted on Jan 08, 2009
Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.
Posted on Mar 11, 2009
Sounds like they wired it direct to line voltage , it should run through a sequencer or fan relay to cycle on and off , your seq./relay could be stuck closed to but unlikely being it was just repaired , call the service company back before you do anything they are responsible.
Posted on Apr 11, 2009
The inducer blower will put a vacuum on your pressure switch which in turn will tell the board to apply power to the ignitor. If you have a vent blockage, dirty air filter, plugged condensate line or any blockage of either vent or air intake, the furnace will lock-out and flash an error code on the circuit board. If after inspecting all the above for debris and found nothing, you can quickly jump the pressure switch after the inducer starts to see if the ignitor glows. You could also have a bad ignitor. Yes the lock-out is normal. Looks like you discovered the cause on your own, order a new switch.
Posted on Feb 15, 2010
Testimonial: "Thanks for you quick answer - I already checked vents/tubes/cond. Older furnace so no led's - wasn't sure about lock out sequence - I'll get switch!!"
If you are using strip heat as seperate mode you must install a fan isolation relay which would be energized by emergency ht mode of stat.
Posted on Nov 25, 2012
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