Heat constantly stays on

[Irishjedi]

Hi,

My heat has been staying on even when I turn it down to Eco. I actually have to disable heating at the boiler for it not to heat up.  I set to Eco last night and it is 71 in the house and 56 outside.  I was only running a red and white wire and installed a C wire hoping that this would solve the problem.  Could the thermostat be bad? Battery?

My thermostat cable runs to a Taco 3 zone switch relay, not directly to the boiler.

Thank you.

[EdwardT]

Hi Irishjedi,

Thanks for reaching out. I'm sorry to hear that you're having an issue with your Nest Thermostat. To isolate the issue, could  you try removing the display of your Nest Thermostat and check if the heating would turn off?

Thanks,

Edward

[EmersonB]

Hi everyone,

@Irishjedi checking in to see if you still need help. Let me know if you have additional questions.

I appreciate your help, @Edward.

Regards,
Emerson

[EmersonB]

Hello Irishjedi,

We haven’t heard any updates from you. I’ll go ahead and lock this thread in 24 hours. If you're still in need of assistance, feel free to start a new thread and we'll be happy to help.
 

Best,

Emerson