Nest No Power To R

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You should also make sure your drain pan isn't clogged and that your float switch hasn't been tripped. Why is there no power to my nest thermostat? If your nest thermostat won't turn on, the batteries could have drained or there could be a power issue. If no power has been going to the rh wire for more than 12 hours because the thermostat has not been receiving power for more than 12 hours for any reason, its internal battery might have drained.

Your nest thermostat will show you with a blinking light. Quick little article on my findings. So, last week, my nest thermostat starting acting up. It would shut down and the screen would go black. The ac would not crank up and it was hot in my house. I know this in not it or security related, but is technology related and thought and hoped it would help. We have looked through these problems and found that a good number of nest thermostat users have encountered a problem that said the nest thermostat has no power to rh wire. This error has a code name of error code e74. What nest has said about this particular error is that it occurs when the rh wire receives no power.