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Central heating randomly turning on

A couple of months ago we had a prolonged power outage (nearly 8 hours). When the power came back on, the ducted central heating fan turned itself on and ran for a couple of hours, even with the thermostat turned off at the wall. Since that time the heating fan turns on and off randomly for short periods of time. A plumber looked at the unit and found nothing wrong and so replaced the thermostat (from a dial to a digital). Today the fan turned on and off again, the new thermostat digital display appears to be flicking on and off without being touched and it is switched off. I have checked other forums and no the roof space is not hot (and has not been since this problem started) Can anyone suggest what is wrong?

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New thermalstat

Posted on Apr 13, 2014

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SOURCE: central A/C motor blade turns all the time

it is just possible that an air draft thro rhe fan blades is turning the motor. to check, disconnect the motor and see if it still turns. disconnect from mains before doing this

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SOURCE: central air unit problem

Check inside that breaker box for fuses.

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It sounds like you might have a short in the wiring that goes from the furnace (inside part) to the condenser (outside part). Follow these lines by hand and check to see the wire isn't damaged and shorting out.

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the control board is bad safety feature of carrier board . Tom

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kingbrizzle
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SOURCE: Carrrier Central heat and air. Model 38CKC042300,

Unfortunately no, this is one of three things.
1. Compressor is worn and is starting to pull to many amps to operate. Can possibly be fixed by putting a hard start kit on the unit, but will have to be done by a technician.
2. Compressor has an internal short and will have to be replaced.
3. Fuses bad or under sized. Max fuse size is stated on information plate on outside unit.

Sorry to hear about your troubles and hope you can get it fixed soon!

Posted on Aug 15, 2010

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