You have a problem with the boiler. It has lost it's supply voltage or low/control voltage. Check any breakers to it. If it has an access panel, be sure it is on and secure. We don't have many boilers here in Texas so this may not help you at all but it's worth a chance. You may need to call a technician.
Testimonial: "thank you - it turns out the thermostats weren't even connected. I figured out the boiler - but it still wouldn't heat the house. A real joke - the former owner was a scammer."
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