Google Nest Learning Thermostat (4th gen) Installation Guide
Troubleshooting - Power Solutions
1.
If your thermostat has power-related issues, like the baꢀery draining too quickly or Wi-Fi constantly
disconnecting, you can typically fix them by connecting a common wire (C wire) or by installing the
Nest Power Connector. Either one will provide a stable power source for your Nest thermostat when your
system can’t deliver enough consistent power to it.
Please Note: A Power Connector is needed for each thermostat in a Zoned system.
2.
Use a spare wire as common wire
The easiest way to solve the problem is by using a spare wire in the thermostat wire as a common wire.
Simply connect one end of the the unused wire to the common (“C”) terminal in the HVAC controller and
the other end to the thermostat’s C terminal.
3.
Add a resistor to an existing Y or W wire
We’ve found that many Y and W wire circuits that cannot supply enough power can be strengthened by bridging
the common terminal at the HVAC equipment to W or Y through a 220-ohm, 5W resistor.
In a heat-only system, you need to bridge from common (C) to W. In a HVAC system with a Y wire, you must
bridge from common (C) to Y. In a system with both W and Y, you should bridge from common (C) to Y.
Heat only systems
Heating and cooling systems
4.
Pull a new C wire
Replace the thermostat wiring bundle to provide an extra wire to be used as common. Advise your customer
that this will require extra work and therefore an additional cost.
79
| General | Details |
|---|---|
| Name | Google Nest Learning Thermostat (4th gen) Installation Guide |
| Make | Nest |
| Language | English |
| Filetype | PDF (Download) |
| File size | 17.85 MB |
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