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Troubleshooting Quick Reference Guide
Symptom:
What’s going on:
Steps to fix:
Nest doesn’t turn on
after installation
Red LED blinking on
front
The internal battery is low and needs to
charge.
If you leave it where it is, it will slowly
charge and eventually turn on. This can
take an hour or two.
If you have a micro-USB cable and wall
charger you can charge it more quickly
over USB.
Nest doesn’t turn on after installation
No LED blinking on the front of the unit
The power was never turned back on.
Use normal electrical troubleshooting
techniques to isolate the issue to either
the fuse/breaker box or a fuse on the
HVAC controller board.
Unit seems to be running backwards
(HEAT PUMP)
If it is heating when it is supposed to be
cooling and visa versa, the orientation of
the heat pump is probably incorrect.
Follow these steps to change the heat
pump orientation:
1. Press the ring to bring up the
menu
2. Turn the ring and select
SETTINGS
3. Turn the ring and select
EQUIPMENT
4. Turn the ring and select HEAT
PUMP
5. Change from B to O based on the
orientation of the heat pump.
Fan doesn’t come on
Either there is an issue with the air handler
or with the Nest Thermostat.
First, check the wiring to make sure the
wires are in the right place and the wire
tips are straight and fully inserted into the
connectors.
If that doesn’t work, turn off HVAC
breakers and pull out the Rh and the G
wires. Carefully hold them together with
the copper ends touching for 10-20
seconds.
If the fan turns on there may be a
hardware issue with the device, so please
contact us.
If the fan did not turn on, there is an issue
with the heating and cooling system
unrelated to the Nest thermostat.
If an electric furnace is present ensure it is
not configured as GAS. Gas heat does not
activate G.
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