The nest thermostat keeps sending signals to turn on the heater and then immediately cut it off.
I asked the HVAC guy to take a look and confirmed that the equipment is all good if bypassing the nest thermostat.
Also, the nest thermostat can detect Rh but sometimes it cannot.
After talking to google via chat, the nest seemed to be fine after removing the c-wire. So he suggested grounding the c-wire properly.
On the second day, I asked a technician from OnTech to check the c-wire. He said the wiring looked correct but cannot figured out why the nest behaved abnormally. He opened a ticket with Google and suspected it is a compatible issue.
I had another nest learning thermostat on the second floor with the same setup and everything is fine so far.
It is very weird.
The wires were set up by a technician from OnTech and worked fine initially.
Talked to google team through the chat that night I posted in the community, and we found that the nest behaved normally after removing the c-wire.
On the second day I asked a technician from OnTech to check the c-wire but still didn't have a solution on it.
