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Nest thermostat chatter

Pepe18
Community Member

Relay box hasva chatter when heat is connected.

25 REPLIES 25

Houptee
Silver Product Expert
Silver Product Expert

What kind of heating system do you have? Is it hot water system with radiators or baseboard?

Do you have zone valves?

Post pics of the relay box where the thermostat wires connect at the heating system.


Houptee -- NJ Master HVAC Licensed Contractor

Jeff
Community Specialist
Community Specialist

Hi Pepe18,

I just wanted to jump in real fast to see if you saw Houptee's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.

Thanks,
Jeff

Pepe18
Community Member

Heating system is gas fired. The chatter takes place at the A/C box (actually it is the A/C relay the one coming On and Off. This is located on the compressor housing which is in the garden outside, whereas the evaporator and furnace box are in the attic. Chatter only takes place when heat is on. Thanks.

Pepe18
Community Member

I should have said it is a forced air heating system, Lennox.

Houptee
Silver Product Expert
Silver Product Expert

Is it a Heat Pump system that runs the outside unit when heat is on or a regular gas furnace with ac?

If its a regular non heat pump system, then the outside unit relay should not even be trying to energize and would possibly be caused by wires touching somewhere.

If it is a heat pump then check wires are tight on the screw terminals and if any wire nuts on the thermostat wires check they are good connections no loose or corroded.

That outdoor relay is called a Contactor Relay and it could just be worn out and going bad if all the wires look good. You can buy them online just search for 24 volt contactor they are easy to replace. Pull the power disconnect outside and turn off furnace power inside also if you try to replace it since the 24 volts comes from indoor unit and the 220 volts is the outdoor unit disconnect box.


Houptee -- NJ Master HVAC Licensed Contractor

Pepe18
Community Member

I tried to answer from my mail box… no luck…lol

regular gas furnace, forced air. I have had to replace contactors about 3 or 4 times in the last couple of years because the chatter burns them. Perhaps the contactor  is improperly wired?

Houptee
Silver Product Expert
Silver Product Expert

Maybe the transformer is weak and causes contactor to not fully pull in.

If all the wires are clean and tight only thing I can think of is low voltage from transformer.

You can get one online on Amazon or other websites.

I would use a transformer rated 24v 40VA in the furnace that will be plenty of power.


Houptee -- NJ Master HVAC Licensed Contractor

EdwardT
Community Specialist
Community Specialist

Hi folks,

 

@Houptee, thanks for the help!

 

@Pepe18, how's it going with your Nest Thermostat? Still need our help?

 

Thanks,

Edward

Pepe18
Community Member

Yes. Still chatters, not a very fast chatter, though. Checking online I see it is a common complaint of users all over the country. 

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

 

Thanks for the response. I'm sorry to hear that you're still experiencing this issue. I'd love to know more about this and I have a few questions:

 

  • What type of Nest Thermostat do you have?
  • How is your Nest Thermostat wired?
  • What is the power reading of your Nest Thermostat? You can find this info by going to Settings > Technical Info > Power.

Thanks,

Edward

Pepe18
Community Member

Thanks for your reply.

i took some pictures of the info supplied by the NT

272EFB0C-D301-41A8-BCAF-1CA78364B426.jpeg29B69AED-5EF4-482C-AA41-32F6E8A8FF2D.jpeg09C1448C-2863-4B23-B683-827A7A5E78CA.jpeg

Pepe18
Community Member

144FCF98-08F3-4104-9012-1B6EE5A99826.jpegE3D0623B-55FA-465C-B615-3BFDBC133DD4.jpeg0FB4EB8A-0EAA-4A1D-850F-1699F7E39BC4.jpeg

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

 

Thanks for the response. Your wiring and the power reading looks good. To isolate the issue, could you try removing the C wire? Please make sure that you turn off the breakers before touching any wires.

 

Let us know how it goes.

 

Thanks,

Edward

Pepe18
Community Member

Just disconnected it. Will check it during the weekend.

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

Thanks for the response. Please let us know the results once you've tried the steps. Keep us posted.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

Pepe18
Community Member

So far chatter has stopped. C wire is still disconnected.

thanks again.

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

Thanks for the update. I'm glad to hear that it's working fine so far. I will be locking this thread in 24 hours. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

Thanks,

Edward

Pepe18
Community Member

Thank you once more.

z

(

only concern would be regarding if the removal of C wire could affect the cooling aspect of the unit., in that case we can always go back to the original configuration).

have a nice Thanksgiving Day!

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

Thanks for the response. Your cooling should still work without the C wire but you're correct, in case something comes up, you can always connect it and reach out to us so we can investigate further.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

Pepe18
Community Member

Edwin, so far everything is OK. No more chatter after I disconnected the C wire as suggested.

EdwardT
Community Specialist
Community Specialist

Hi Pepe18,

Thanks for the update. I will be locking this thread now. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

Thanks,

Edward