Unexpected Furnace Startup

[Casey2019]

Cold start boiler.  Temperature well above call for heat temperature.  Furnace temperature less than 80 degrees.

Have first floor and second floor Nest thermostats.  Every 6 hours give or take 1 minute first floor zone valve lights up, furnace goes through its 8-10 second start sequence, fires up for 1-2 seconds and shuts down.  When I pull first floor thermostat off base 1st floor zone valve does not do this.

Any ideas?  Can Nest 3 therm. be causing this?

[ByronP]

Hi Casey2019,

Thank you for posting in the community. I'm sorry that you're experiencing unexpected heating troubles with your furnace and  Nest Thermostat. I understand how frustrating this can be. I'm here to help.

Before I begin, I need to ask a few questions to further assist you:

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 error 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?

Please keep me posted. I'll look forward to your response.

Regards,

Byron