dc-resistance-low-power-off on an Enphase Energy Enphase IQ8 microinverters: Microinverter insulation-resistance sensor measured PV+ or PV- to earth below ~7 kOhm; it stops producing and shows solid red LED
Short answer
On an Enphase Energy inverter, dc-resistance-low-power-off means: Microinverter insulation-resistance sensor measured PV+ or PV- to earth below ~7 kOhm; it stops producing and shows solid red LED. 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 insulation-resistance sensor measured PV+ or PV- to earth below ~7 kOhm; it stops producing and shows solid red LED.
Part involved: microinverter IR sensor / PV module insulation.
When it shows: Microinverter insulation-resistance sensor measured PV+ or PV- to earth below ~7 kOhm; it stops producing and shows solid red LED.
Likely causes:
- Defective module insulation, defective wiring or connectors, moisture ingress or similar.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter keeps running with some functions stopped.
Resetting itself: no.
Manual reset: Cleared remotely by the installer via Enphase Installer Platform (Events > DC Resistance Low - Power Off > device > Tasks > Clear GFI); clears only if the cause is gone.
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.
- Only the affected panel(s) stop; the rest of the system keeps generating.
- Contact your installer - the reset is done remotely through the installer platform.
What the engineer will check
- Clear via Installer Platform; if it returns, measure PV+ and PV- to earth on module and microinverter (anything below ~7 kOhm trips it); swap faulty module or microinverter.
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
- Installation and Operation Manual - UK: Enphase IQ8MC, IQ8AC and IQ8HC Microinverters ↗ · IOM-00029-1.0 (September 2023) · page 20-21 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026