Heat Pump Aux Heat buzzing (Update-Fixed)

[kenimpzoom]

I have an A/C style heat pump with elec aux heat. Inside furnace a/c unit is Trane.

While trying out the heater, I turn on the heat pump and all is well, I continue to turn up the thermostat, kicking on the aux heat, and then a loud buzz eminates from inside the furnace in the attic.

I coincedentally just changed the thermostat to a digital one. New thermostatic is compatable with heat pump with aux heat (I checked it before buying). It is a "ritetemp" model 8050C.

I am not sure if the loud buzzing is a result of the heater not working all summer, or the new thermostat is causing it.

Wires from furnace to old thermostat are: R, O, G, Y, B, W

Now wires to new thermostat are: R, O, G, Y, W with B left disconnected as per new thermostat instructions.

My question is, is there wires I can jump to kick on the aux heat and see if the thermostat is the problem, or if my furnace has a problem? What is proper voltage to W wire to kick on the aux heat?

Thanks, Ken

 

[stevieray]

Re: Heat Pump Aux Heat buzzing

Re: Heat Pump Aux Heat buzzing

ken - is the aux heat working? (you'd smell it before you felt it). If it is, let it run for a while & see if buzz stops. If it doesn't work, sounds like a relay not contacting fully - that will make a loud buzz.

 

[kenimpzoom]

Re: Heat Pump Aux Heat buzzing

Re: Heat Pump Aux Heat buzzing

I disconnected the W wire from the thermostat and thus prevented the aux heat from coming on. However, when the compresser kicked into reverse, that triggered the aux heat, and the loud buzzing again. I let it buzz for about 5 minutes and it never got quieter. I believe the aux heat is working as I smell it.

I am gonna hook back up the old thermostat and see if I get the buzzing sound. If so, I will investigate further.

Ken

 

[kenimpzoom]

Re: Heat Pump Aux Heat buzzing

Re: Heat Pump Aux Heat buzzing

It isnt the thermostat, old one cuased buzzing too.

I am almost certain the contactors are shot as I press on them and the buzzing quiets down.

Gonna try that.

Ken

 

[kenimpzoom]

Re: Heat Pump Aux Heat buzzing

Re: Heat Pump Aux Heat buzzing

It was the contactors. 38 bucks for two and all is quiet.

Ken

 

[Reel Poor]

Re: Heat Pump Aux Heat buzzing (Update-Fixed)

It's cool to have heat. 8)

 

[stevieray]

Re: Heat Pump Aux Heat buzzing (Update-Fixed)

Killer is - if you called in a service guy, he probably would have told you the whole thing was shot & quoted you about 5K for a new one! There's one born every....well about 47 seconds nowadays.