# Enphase microinverters: grid frequency out of range — what to do

The Enphase microinverters saw the utility grid frequency outside the range they accept, so production pauses. This usually comes from the grid rather than from your equipment, and it is not an emergency. Check the app, wait for the grid to settle, and get it looked at if it keeps coming back.

## What we see across our fleet

- We have seen this fault on 371 Enphase systems, 7.4% of the 4,980 Enphase systems we monitor (last 12 months).
- Once it appears, the system usually clears it in about 419 hours (median), and 0% clear within 24 hours.
- Source: Otovo fleet monitoring and service records, data through August 2026.

## Common causes

- The utility grid frequency was briefly outside the allowed range.
- A utility outage or switching event in your area.
- A wiring or AC problem on the property, which only an installer can test.

## Safe steps to try

1. **Note the alert** Open the Enphase App and write down the alert text and the time it appeared.
2. **Check whether it is a one-off** Look at your production graph. If production returns after a short pause, the grid has settled.
3. **Check the solar breaker** Make sure the solar breakers are on. If one is off, switch it on once only. Do not open any panel cover.
4. **Check with the utility** Enphase says to verify with your utility that the line voltage and frequency are in range. Ask whether there are outages or grid work in your area.
5. **Watch for a repeat** If the alert returns, record the dates and times to give to your installer or service provider.

## When to call a professional

Call a professional if the alert repeats on several days or production stays at zero after the grid is stable. Otovo services these systems and can diagnose this fault. Do not open any equipment or touch wiring.

## Frequently asked questions

### Is this a fault in my solar system?

Often not. A flashing red status light on a microinverter means the AC grid is absent or not within specification, which can come from the utility side.

### Who can I ask about the grid?

Your electric utility. Enphase advises checking with the utility that the line voltage and frequency are in range.

### Can I change the limits myself?

No. Only a qualified installer working with Enphase should review grid settings.

### Do I need to restart anything?

No. Check the breaker once and wait. Do not repeatedly switch equipment on and off.

Canonical page: https://otovo.com/repair/enphase/grid-frequency-out-of-range