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Nest learning thermostat connects to an oil boiler with Carlin ProX 70200 burner

unknownling
Community Member

Nest learning thermostat replaced the original old thermostat that controls the oil boiler for heating only. Only two wires used: W1 and RH. Pretty straightforward. And it did bring up the oil boiler and burner successfully after install, if I set the temp 2 degree above the current room temp, and the screen turned orange indicating heat is working. 

 

However, after installation, the burner sometimes started itself (and the boiler) even when the current temp is 2 degrees above the setting temp. While the boiler was generating heat, the nest app screen did NOT turn orange, which means the nest didn't ask it to work or think it's working. But the burner did get a T-T jump signal to trigger its start. I think its T1 and T2 terminals are connected to W1 and RH in the thermostat.

 

I have turned off all smart features and all schedules, but the burner still irregularly kicked itself off and started working. What's the cause of this issue? Not compatible with the Nest thermostat?

 

 

 

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23 REPLIES 23

Frustratedddd
Bronze
Bronze

UK?

 

US

Sorry, as I thought you might be UK, and then I could help

unknownling
Community Member

Why the location matter?

Because in the USA you do not have a Heat Link in your system do you?

Marco7
Community Member

Any luck with this issue? I have the same problem!

Bassphil
Community Member

I have the exact same issue. I just got this control unit attached to my boiler. Has anybody figured it out yet?

Jhonleanmel
Community Specialist
Community Specialist

Hi Bassphil,

Thanks for reaching out. I'd love to know more about this. Could you share a photo of your current thermostat's wiring?


Thanks,
Mel

Hi Mel, thanks for replying! I don't see to have permission to drag and drop a photo, so here's a Dropbox link: https://www.dropbox.com/s/6n2ru3erbwrzvo3/Nest%20Wiring.jpg?dl=0

It's a very simple setup for an oil burning steam heat furnace that is also providing hot water to the house- 2 wires, W1 and RH. 

I should note that the Nest was working fine with the previous control unit for over a year.

I just replaced the Nest with the simple Honeywell thermostat that I was using before I installed the Nest and everything is working fine, so the Carlin appears to be functioning as expected. 

Jhonleanmel
Community Specialist
Community Specialist

Hi Bassphil,

I'm sorry to hear that you're still having an issue with your Nest Learning Thermostat. We'd like to take a deeper look into this — could you fill out this form and let us know once you're done?

Thanks,
Mel

Dan_A
Community Specialist
Community Specialist

Hey there,

 

We haven't received your form. Have you had a chance to fill it out? Just in case here's the link.

 

Best,

Dan

Dan_A
Community Specialist
Community Specialist

Hi folks,

 

Do you still need help with your device? If so, kindly fill out this form.

 

Thanks,

Dan

Bassphil
Community Member

Okay, I just submitted the form. Thanks!

 

Jeran
Community Specialist
Community Specialist

Hey there Bassphil,

Thank you for filling out that form! You should have someone from Nest Support reach out to you via e-mail, so feel free to continue the conversation over there. In the meantime, do you have any more questions from us here on the forum?

Best regards,
Jeran

aatienza
Community Specialist
Community Specialist

Hey there,

 

Since this thread hasn't had activity in a while, we're going to close it to keep content fresh. Feel free to submit another post, and provide as many details as possible so that others can lend a hand.
 

Thanks,
Archie

Hi! Before you close it, it be great if somebody actually had an answer for this. I filled out the form for support, and as soon as I had an answer, I was going to post it here.

Bob718
Community Member

I too would like to see the answer. I have the same Carlin unit and my furnace does not shut off. I do get an error for no power to RH. 

Jeff
Community Specialist
Community Specialist

Hey Bassphil,

 

Did you ever get in touch with support and get an answer from them on this?

 

Thanks,
Jeff

Bassphil
Community Member

Hi Jeff, yes. Unfortunately, their response was that it needs a C wire. Weird, since it worked fine with the previous control unit. 

Jeff
Community Specialist
Community Specialist

Hey Bassphil,

 

Now that you know you will need a C wire, is that something you can get and make happen? Is there a way we can continue to help you on this, or will you need to work with an HVAC professional?

 

Thanks,
Jeff

Jhonleanmel
Community Specialist
Community Specialist

Hi folks,

Chiming in to see if you still need assistance with this. Let us know if you have additional questions ― we'd love to help.

Best,
Mel

Hi everyone,

Just one quick final check in here since activity has slowed down. We haven't heard from you in a while so we'll be locking this thread if there is no update after 24 hours. If you have any new questions, updates or just a discussion topic, feel free to start a new thread in the Community.

Thanks,
Mel

Bassphil
Community Member

Thank you Dan! I’ve been trying to find a moment to get to my laptop to fill out the form. Maybe tonight…