Fan will not shut off on Trane Heat Pump

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  #1  
Old 01-21-12, 05:30 AM
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Fan will not shut off on Trane Heat Pump

I have a 10 yr old Trane heat pump. The fan will not turn off once the aux heat hits the temperature set on the thermostat. I have to turn the thermostat down four degrees (from 68 to 64) to get the fan to shut off. The fan is set on AUTO. I had a winter check from an HVAC company in November and I was told the unit was in good shape. From what I've read in forums the fan should turn off within 30 seconds.
 
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Old 01-21-12, 07:29 AM
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Sounds like a fan relay. But you should run your fan 24/7 in heat mode.
 
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Old 01-21-12, 07:34 AM
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My thermostat is set on HEAT and the fan is set on AUTO. Is this what you mean?
 
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Old 01-21-12, 10:28 AM
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Since the stat is usually in the center of the space and the bedrooms are at the perimeter, the stat will sense the temperature in the bedrooms better when the fan is always running.

I still don't do this. It feels like cold air is entering the rooms when the heat has cycled off.

The problem is probably a faulty sequencer. It is tough to predict when they will fail. It is not hard to prove with a meter when they have failed.



 
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Old 01-21-12, 10:58 AM
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Thank you. I will have someone come out and check this. When I had the unit checked in November the technician was supposed to check everything. Is this something he should or probably did check?
 
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Old 01-21-12, 11:52 AM
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There is really no way to predict when a sequencer will fail.
 
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Old 01-21-12, 11:55 AM
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Thank you. I will have this checked.
 
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Old 01-21-12, 02:48 PM
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it may be normal. Are you sure that only the fan is running and not the HP as well. Just because the inside temp and setpoint are the same does not mean that the stat is not still calling for heat. Digital thermostats hold tighter tolerances.
 
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Old 01-21-12, 03:31 PM
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Cool air is blowing out and the fan will stay on for hours. I checked it last night to see how long the fan would run after the thermostat hit the desired temperature and it ran for over an hour without stopping. It only stopped after I turned the thermostat down from 68 to 64.
 
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Old 01-21-12, 03:54 PM
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It only stopped after I turned the thermostat down from 68 to 64
This points away from the sequencer.
I now agree with hvactechfw's post.
 
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Old 01-26-12, 10:53 AM
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fan will not shut off

sounds like sequencer mine did same on carrier hp system the switch fell apart then the fan and everything finally quit
 
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Old 09-25-13, 09:44 PM
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Can u replace yourself or do u need a pro?
 
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Old 09-26-13, 08:16 AM
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What are you trying to replace and on what type of unit? This thread never did have the final results posted as to whether or not the OP resolved his issue. If you post what your issue is I am sure someone will be able to assist.
 
 

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