How do I fix Grid Outage, Running on Backup on a Tesla?

Confirm whether a real outage exists. If yes, no action, reconnection is automatic. Then: If the grid is live, check Gateway grid-side connections and the main fuse or isolator.

Tesla

Grid Outage

Grid Outage, Running on Backup

Gateway detected grid loss or disturbance and islanded the home onto Powerwall backup.

Common causes

Real DNO outageSupply quality issueLoose grid-side connection

What to check

STEP 1

Confirm whether a real outage exists. If yes, no action, reconnection is automatic.

STEP 2

If the grid is live, check Gateway grid-side connections and the main fuse or isolator.

Escalate if

Repeated islanding on a healthy grid with tight connections

Need full interactive diagnosis?

Faultpath walks you through decision trees, fault codes, and commissioning — built for solar & battery engineers.

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More Tesla fault codes

ALT-01

Breaker Open

ALT-02

Device Offline / Gateway Offline

ALT-03

Backup Failed / No Power During Outage

ALT-04

Calibration Discharge to 0%

ALT-05

CT Reading Error — Negative Solar or Grid