I installed a switched receptacle and a short length of cord with plug in the power line to the gas furnace in order to simply change to a different power source in case of a power failure. My alternate power source is a Bluetti AC200 MAX. The Bluetti has a 2200 watt pure sine wave inverter. In a power failure I would simply unplug the cord from the receptacle and plug in to an extension cord from the inverter.
When plugged into line power as normal everything works fine including the nest. When the nest calls for heat the furnace starts up the burners and the fan. After switching over to the inverter everything looks normal. The nest is happy but when nest calls for heat the furnace does nothing. Haven't seen any errors. Switch back to line power and everything works again. I will swap out the nest tomorrow with an older simple tstat for comparison. Anybody seen anything like this?
