How do I fix PEN Fault Detected on a Growatt?

Do not reset and continue operation. A PEN fault on a PME network is a serious supply fault and a shock hazard. Notify DNO immediately Then: Check if other THOR units or other equipment on the same PME supply are also affected. This is a supply infrastructure issue, not an EVSE fault

Growatt

THOR-116

PEN Fault Detected

THOR has detected a PEN (Protective Earth + Neutral combined) conductor fault on a TN-C-S (PME) supply. Safety shutdown. LCD shows 116.

Common causes

PEN conductor failure or high resistance on TN-C-S networkSplit neutrals at consumer unit

What to check

STEP 1

Do not reset and continue operation. A PEN fault on a PME network is a serious supply fault and a shock hazard. Notify DNO immediately

STEP 2

Check if other THOR units or other equipment on the same PME supply are also affected. This is a supply infrastructure issue, not an EVSE fault

Escalate if

Always escalate PEN faults — this is a DNO and electrical safety issue. Do not use the charger until supply is confirmed safe

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More Growatt fault codes

Error 200

AFCI — Arc Fault Detected

PV Isolation Low (RISO)

Error 300

AC Voltage Out of Range