On the covered Google Nest Protect alarm, no power light (power out) means power out. Google says a wired Nest Protect's wired power is out and it is running from its battery. First, check the circuit breaker for the circuit the Protect is on.
Differential
Likely causes of “Google Nest Protect alarm showing no power light (power out)”, and how to tell them apart
- 1
A tripped breaker
What separates it The wired Protect lost mains power
How to confirm Check the circuit breaker
- 2
A loose connection at the base
What separates it The wires are not seated
How to confirm A qualified electrician checks
- 3
A power cut
What separates it The whole house has no power
How to confirm Wait for power to return
- 4
A failed supply
What separates it The circuit is dead
How to confirm An electrician diagnoses
- 5
The Protect running on batteries
What separates it The unit continues for a while
How to confirm Replace batteries if low
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether other devices on the circuit work
- Whether the batteries are low
- The model
Try in this order
0 of 8 completedWhat to do first
ReversibleCheck the circuit breaker for the circuit the Protect is on.
Correct only the documented fault domain
ReversibleGoogle points to its wired-Protect power troubleshooting article. The Protect keeps running on its backup batteries meanwhile, so replace them if the message says they are low.
Check the circuit breaker
ReversibleFor that circuit.
Check other devices
ReversibleOn the same circuit.
Replace the batteries
ReversibleIf the message says low.
Do not touch the wiring
ReversibleWithout power off.
Call an electrician
ReversibleIf the breaker holds but power is out.
Read Google's article
ReversibleOn wired Protect power.
Model-specific
What is true of this model and not of its siblings
- Mains and backup
- A wired Nest Protect takes mains power and holds backup batteries. When mains fails, it keeps working on the batteries, and tells you.
- Google's guidance
- Google points to its wired-Protect power troubleshooting article and says to replace the batteries if the message says they are low.
- Safety
- Switch off the breaker before touching wires, and use an electrician if unsure.
Stop boundary
When this stops being a self-service repair
- !The Protect keeps running on its backup batteries meanwhile
- !Wiring is for a qualified electrician
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does no power light (power out) mean on a Google Nest Protect alarm?+
Power out. Google says a wired Nest Protect's wired power is out and it is running from its battery.
Does it still work?+
On its backup batteries.
What do I check first?+
The circuit breaker.
Who rewires it?+
A qualified electrician.