critical-temperature on an Enphase Energy Enphase IQ8 microinverters: Microinverter internal temperature exceeds rated range; it reduces power until it cools
Short answer
On an Enphase Energy inverter, critical-temperature means: Microinverter internal temperature exceeds rated range; it reduces power until it cools. The inverter keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Microinverter internal temperature exceeds rated range; it reduces power until it cools.
Part involved: microinverter.
When it shows: Microinverter internal temperature exceeds rated range; it reduces power until it cools.
Likely causes:
- Hot conditions, poor airflow under module.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The inverter keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Automatic when temperature falls.
What you can check
- Open the Enphase App (or Enlighten) and note the event name, affected microinverter serial number(s) and date/time for your installer.
- No action unless it persists.
What the engineer will check
- Check mounting clearances under module; contact Enphase Support if persistent.
Who to ask for: Enphase-certified installer / MCS PV installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Installer's Guide to Troubleshooting an Enphase System ↗ · August 2014 · page 37 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026