How do I fix PEN Fault — Do Not Use Charger on a Enphase?

Do not attempt to reset or use the charger. A PEN fault is a serious supply safety issue. Disconnect charger at MCB. Inspect supply earthing arrangement and contact DNO Then: Check if other Type B RCD-protected equipment on the same supply also shows faults. This may affect the entire PME earthing arrangement at the property

Enphase

EV: Alternate Blink Red

PEN Fault — Do Not Use Charger

IQ EV Charger 2 LED segments alternate blinking on/off in red — PEN (Protective Earth/Neutral) fault detected on supply. Safety shutdown.

Common causes

PEN conductor fault on TN-C-S (PME) networkBroken or high-resistance combined protective earth/neutral at supply headDNO infrastructure issue

What to check

STEP 1

Do not attempt to reset or use the charger. A PEN fault is a serious supply safety issue. Disconnect charger at MCB. Inspect supply earthing arrangement and contact DNO

STEP 2

Check if other Type B RCD-protected equipment on the same supply also shows faults. This may affect the entire PME earthing arrangement at the property

Escalate if

Always escalate PEN faults — notify DNO and do not operate the charger until supply is confirmed safe by a qualified electrician

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More Enphase fault codes

ACVOOR

AC Voltage Out of Range

ACFOOR

AC Frequency Out of Range

DC Res Low

DC Resistance Low (Ground Fault / GFDI)

DC Too Low

DC Input Voltage Too Low

DC Too High

DC Input Voltage Too High