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Thermostat Issue or Boiler Issue?
Hi everyone. I've had a Nest thermostat installed for a couple years without issue. The nest controls my gas fired steam boiler and my air conditioning for my first floor. A few weeks back during the "bomb cyclone" on the east coast, I woke up in the middle of the night to a cold house. I checked the nest app on my phone and the nest was "offline". In summary, the Nest was no longer recognizing power power from the Rh wire. I attempted to troubleshoot without any success. I installed a spare honeywell thermostat that I had laying around and boom, boiler kicks on without any problems. Nest has sent me a new base plate, which didn't solve the problem, and then an entire new display, which has not solved the problem either. Meanwhile the honeywell has continued to work fine. The folks at Nest believe that there is some issue with the voltage coming from the boiler, that something went haywire during the night when it was very cold. Before calling an HVAC expert, wanted to see if this is something I could tackle myself...thinking maybe a fuse needs to be replaced on my boiler? (no idea if I'm heading in the right direction or not - this is very far from my area of expertise). Either way, thanks in advance for any help that can be provided.