How do I fix Will Not Enter Backup (Grid-Forming) Mode on a Tesla?

Check state of energy, very low SOE prevents grid-forming. Then: Verify backup config and that automatic grid-forming retries are enabled in Tesla One.

Tesla

Inverter Not Going To Vf

Will Not Enter Backup (Grid-Forming) Mode

Powerwall not transitioning to grid-forming mode, backup will fail in an outage. Critical.

Common causes

Very low state of energyGrid-forming retries disabled

What to check

STEP 1

Check state of energy, very low SOE prevents grid-forming.

STEP 2

Verify backup config and that automatic grid-forming retries are enabled in Tesla One.

Escalate if

Charged unit still refuses to form a grid

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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