Solar · Error codes · myenergi
4-4myenergi · eddi solar immersion diverter
4-4 on a myenergi eddi solar immersion diverter: Grid Sensor Error - grid CT incorrectly installed
Short answer
On a myenergi inverter, 4-4 means: Grid Sensor Error - grid CT incorrectly installed. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Grid Sensor Error - grid CT incorrectly installed.
Likely causes:
- CT on wrong cable or polarity wrong.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: after correction.
Manual reset: Reboot device from menu or via supply breaker.
What you can check
- Read the fault on the eddi screen. Check the eddi supply breaker is ON. Report to installer.
What the engineer will check
- Check grid CT on live grid cable and polarity.
Who to ask for: Electrician / plumber-electrician for immersion circuits.
Certification: Competent electrician (BS 7671); immersion heater work to Part P.
What you might notice
Sources
- myenergi Help Centre - eddi Installers > Fault Codes ((4)1 to (4)8) ↗ · Help Centre article · page 30222379392913 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026