Nest thinks heating is on but boiler is off

[hkymre]

Nest & boiler are both 5 years old.

In the morning the nest shows as heating, but the boiler is off.
The radiators are warm though so it has been on at some point in the early hours.

If I turn the heating down then up on the nest then the boiler fires up but then switches off very quickly.
Repeating the off/on via nest as few times & then the boiler comes on & works as expected.

Does this sound like a boiler fault or a nest fault, or maybe a wiring issue?

[EdwardT]

Hi hkymre,

Thanks for reaching out. I'm sorry to hear that you're having an issue with your Nest Thermostat. 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 information by going to Settings > Technical Info > Power.

Looking forward to your response.

Thanks,

Edward

[hkymre]

Thanks Edward

It's a Nest 3rd gen - model 3.4

Power values are:-

'battery 3.926V
Vusb 0.02V
vin 10.30 V
lin 200 mA (c)

I've also spoken to the boiler makers tech support & the company that installed the system & they believe the issue is probably with one of the pumps.

[EdwardT]

Hi hkymre,

Thanks for the response. The power reading looks good. Are your pumps going to be replaced? Keep us posted.

Thanks,

Edward

[EdwardT]

Hi hkymre,

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

[hkymre]

Thanks Edward.

We're waiting on the engineers to come out & investigate. Which might be a week or two yet.

[EdwardT]

Hi hkymre,

Thanks for the update. Let us know once your system has been checked. Keep us posted.

Thanks,

Edward

[EdwardT]

Hi hkymre,

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]

Hi hkymre,

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