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Error Code E1

No power to the thermostat.

? What Causes This

Power supply disconnected, tripped breaker, or faulty power connection.

✓ How to Fix It

  1. Check that the thermostat is receiving 24V AC power.
  2. Verify the circuit breaker is not tripped.
  3. Inspect power connections at the base plate.
  4. If power is confirmed but error persists, contact service.

This error code appears in:

Google Nest Thermostat