Trane buzzing


Old 11-02-14, 11:08 AM
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Trane buzzing

TW EO18C140BO Trane Heat Pump 240v
THis unit has a loud and irritating buzz when the heat phase goes stops when
it goes into standby, when its not actively heating but the fan might still be on cause there is still heat coming out of the vent but just a little.
Any techs here know what this might be.... if its just a vibrating metal piece that I can fiddle with ,it would be good not to have to call a tech for a minor nuisance. Its a rental apt.
It sounds like a little metal to metal buzz...any ideas??
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Old 11-02-14, 11:22 AM
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It could possibly be a problem with the reversing solenoid that changes the flow direction of the refrigerant. Not something you can really do much with. Technically as a renter you are limited in what you can or should do to a piece of equipment that is not yours.

You could certainly remove the cover and look inside for something loose.
Old 11-04-14, 08:10 AM
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I looked up on YouTube and 95% of the time its the start relay. a little plastic black thing that
only lasts a few years and makes that exact buzzing noise.
Old 11-04-14, 06:40 PM
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The most common buzz that I see is the contactor. You can turn off the breaker to the outdoor unit and give the thermostat a heating demand to see if the contactor still buzzes since the 24 volt signal is provided by the indoor unit with split systems.

If you give the stat a cooling demand with the breaker to the outdoor unit off you will energize the reversing valve and contactor in the heat pump.

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