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The air handler fan motor on the heat pump air conditioning

Customer Question
Hello. The air handler fan...
Hello. The air handler fan motor on the heat pump air conditioning unit keeps randomly cycling on and off like the motor is trying to start. I replaced the motor start capacitor.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Yes
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: I notice that if I switch the fan setting from on to automatic, this will stop the random cycling.
Submitted: 1 year ago.Category: HVAC
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Answered in 1 minute by:
7/24/2016
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 15,757
Experience: 20yrs in the HVAC industry with certificates and degrees.
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Answer:

Check the low voltage wiring at the contactor and connections out at the unit, if you have a bad low voltage connection that will keep dropping out the contactor causing that issue. Often a thermostat wire that is wire nutted is the issue as the connections go bad.

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Customer reply replied 1 year ago
I'm using a Honeywell RTH9580 WiFi smart thermostat. I also noticed that when this motor cycling occurs, If I just remove the thermostat From its base on the wall, the cycling stops.
Customer reply replied 1 year ago
the fan motor runs normally in scavenge mode until the timer in the air handler times out.
Customer reply replied 1 year ago
The air handler is a Trane Model TWE042C140C0.
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Oh Ok you likely have the pin base correct where the thermostat has pis that go into the base plate to make connection correct?

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Customer reply replied 1 year ago
Do you know where the control circuit board is on this unit
Customer reply replied 1 year ago
Correct.
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

Lets start by the thermostat please remove it and do this....Find the RED and YELLOW wires there do you see them?

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HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

OK can you connect those two wires together and see if the AC comes on and runs fine without issue?

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Customer reply replied 1 year ago
It will take a while to tell. Sometimes this only happens after hours of operation.
Customer reply replied 1 year ago
again, with the thermostat removed, the fan motor is running normally in scavenge mode right now.
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

No problem....do that and see or clean off the base connections and using an eyeglass screw driver after cleaning the connections off carefully bend the tabs so they grab the pins tighter and try it. Often that base is the issue and the pins lose connection with it causing that issue.

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Customer reply replied 1 year ago
I will try that and get back to you later in the day. Thank you.
HVAC Technician: HVAC Guru, HVAC TECH replied 1 year ago

OK great! If i am away I will get to it as soon as I am around...I have some stuff to take care of later but I will be back at some point

All I ask is please use the Star Rating Link at the top of your page before leaving, that is the only way I am paid anything through the site and that will also get you a DIRECT LINK emailed to you to get back to me!.....tips are greatly appreciated so thank you very much for using this service. If you have any other questions just post back to me here anytime!

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