cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
Help
Replies are disabled for this topic. Start a new one or visit our Help Center.

New Nest, wire plate turns on heat and stays on no matter what. Help

GeneLe
Community Member

‎10-04-2023 05:26 AM

Hi all,

Long time listener first time caller. I have a basic oil burner with two wires, R and W. For reasons I wont get into I've had no thermostat the past few weeks and have been simply connecting and disconnecting the raw wires to turn the heat on and off. Because of this I know that the system responds almost immediately to the wires being connected or not. Installing a Nest gen 3 learning thermostat yesterday, as soon as I put the wires into the plate the heating system turned on. This was surprising to me but I continued with the install thinking maybe the device would override once installed. Unfortunately my heat stays on no matter if the device is trying to heat or not. It's as if putting the wires into the plate is equivalent to touching them together. Is the plate defective? What could be going on?  Thank you very much!

 

FWIW The Taco 6 zone system in the basement does have the Cwire screws but the wires themselves have not been run throughout the house. I also have the little white Google Power things. Part of why I got this specific thermostat was the thought that I wouldn't have to use any of that stuff. That said, not sure if that's related to the more pressing problem anyway. 

 

Best,

Gene

0 Kudos
Reply
2 REPLIES 2

speedyuk
Community Member

‎10-06-2023 01:55 AM

Hi GeneLe, I'll reply as it doesn't look like you had one. I just installed a NEST a few days ago and I had what seems like a similar problem to you. Basically my hot water relay was stuck in the closed position. There was no control from the 'software'. By searching I found this a common problem. Resetting the heatsink by holding in the middle button fixed it. I could hear the relay disarm. Control from software now restored. Hope that sorts it for you if you haven't already.

0 Kudos
Reply

Markjosephp
Community Specialist
Community Specialist
In response to speedyuk

‎10-09-2023 06:59 PM

Hello folks,

 

We appreciate both of you getting in touch with us about your heating systems that are constantly running. I'd be happy to take a look at this.

It appears that there may be a power issue or an issue with the thermostat settings. I did find a helpful article to troubleshoot strange heating and cooling behavior. Also, to isolate:

 

  • From what country are you posting?
  • What type of Nest Thermostat do you have?
  • When did the issue start?
  • What other strange symptoms have you experienced since the problem started?
  • Are there any report messages? If so, what are they exactly?
  • Is this a new installation?
  • What kind of HVAC system do you have? (heat pump, conventional system, etc.)
  • Do you notice any intervals or specific patterns between these strange behaviors?
  • When was the last maintenance check for your HVAC system?
  • Have there been any recent changes or upgrades to your HVAC system?
  • Does the issue happen with heating only, cooling only, or both?
  • Gather the power readouts in the Technical Info settings or in the Equipment settings, depending on your Nest Thermostat version.

 

Keep us posted.

Regards,
Mark

0 Kudos
Reply