How do I fix AC Frequency Out of Range on a Enphase?

Check frequency in Enlighten or with a power quality analyser at the consumer unit. Confirm it is a genuine frequency deviation Then: If the event is isolated and self-clearing, no action required. Log frequency history

Enphase

ACFOOR

AC Frequency Out of Range

Microinverter has disconnected because grid frequency is outside the permitted window (47–52 Hz for UK G98).

Common causes

Grid instabilityFrequency event on local network

What to check

STEP 1

Check frequency in Enlighten or with a power quality analyser at the consumer unit. Confirm it is a genuine frequency deviation

STEP 2

If the event is isolated and self-clearing, no action required. Log frequency history

Escalate if

Frequency persistently out of range — notify DNO

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More Enphase fault codes

ACVOOR

AC Voltage 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

Crit Temp

Critical Temperature