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Old 08-28-2014, 10:51 PM   #1
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Air handler on the loose


Hi. I have a Trane XL1800 heat pump with a TWE065E13FBO air handler; Trane Baystat 038A thermostat. Recently, the fan on the air handler seems to run all night. When I get up in the AM, it is still running. I can turn the entire cooling unit off, but the fan continues. If I turn the fan switch on, then off again, the fan goes off. Is this a relay problem? I have had it to do this months ago, but havenít noticed again until recently. The handler works fine during the rest of the day. Thanks for any input.

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Old 08-28-2014, 11:29 PM   #2
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Air handler on the loose


If it were me the first thing I would think of sitting in my lazyboy and where Id start....Hmmm Im going to have to get in that darn attic, kill the power, open the control panel and see if there is anything obviously looks burned on the board. If not blow the blanket of dust off the board with canned air, close everything up and pull out the original thermostat I have in storage that I know is working and switch out the thermostat to see if all is well.

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Old 08-29-2014, 06:48 AM   #3
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Air handler on the loose


If its a programmable thermostat. Make sure the fan isn't set to on in the programming.
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Old 09-16-2014, 03:30 PM   #4
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Thanks; don't think it is the thermostat as it seems to work just fine with ups & downs all day---only sticks in the cool night time.
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Old 09-16-2014, 03:36 PM   #5
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Air handler on the loose


A sticking relay would usually not care if it were night or day or what ambient temperature is. This could be a good place to begin your trouble shooting though.
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Old 09-16-2014, 05:05 PM   #6
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Air handler on the loose


Check the thermostat programming if its a programmable one. It cost you nothing to check it.
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Old 11-01-2014, 02:35 PM   #7
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I have looked and looked to find the proper relay for this unit. Where can I find it? (I also had my HVAC man--saw him by accident--who said to change the relay)
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Old 11-01-2014, 04:54 PM   #8
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I get them from Trane.

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