Nest Thermostat No power to R Wire

Got a Nest thermostat here says, “No power to R wire detected”

0:04.7

0:09.9

Luckily I have a setup where I have other
Nest thermostats so I am just going to change

0:09.9

0:15.3

out the thermostat before I go jumping into
the wiring.

0:15.3

0:20.9

I did on the other one pull the deal off and
reset the R wire to see if it was that.

0:20.9

0:21.9

So here goes.

0:21.9

0:29.0

I am going to go ahead and plug this one in
to here.

0:29.0

0:31.1

This one it is okay.

0:31.1

0:33.9

It does seem to have the R wire.

0:33.9

0:39.4

So on the other one when I take this in I
am most likely going to need to check it at

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0:41.6

the air handler.

0:41.6

0:46.0

It’s possible that the R wire came apart or
something along those lines.

0:46.0

0:49.2

So I will switch this one to off.

0:49.2

0:54.3

I will just take this one back in the off
hand chance that it’s not that and that it

0:54.3

0:57.4

just needed to be reset.

0:57.4

0:58.8

So we’ll see.

0:58.8

1:04.2

But most likely I am going to need to pull
it apart at the thermostat and check the transformer.

1:04.2

1:05.4

Okay.

1:05.4

1:08.3

Plugged the unit back in but that didn’t get
it.

1:08.3

1:12.7

What I had to do was push on the left hand
side of the service door to reengage the service

1:12.7

1:14.0

door switch.

1:14.0

1:15.1

That’s what it was.

1:15.1

1:17.3

All fixed.

1:17.3

1:23.3

That brought the power back to the red wire
and the Nest thermostat back to normal and

1:23.3

1:38.0

the heater working again.

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