Solar · Error codes · myenergi
4-3myenergi · eddi solar immersion diverter
4-3 on a myenergi eddi solar immersion diverter: No Signal - no signal from harvi
Short answer
On a myenergi inverter, 4-3 means: No Signal - no signal from harvi. The inverter stops until the fault clears or is reset.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: No Signal - no signal from harvi.
Likely causes:
- harvi comms, configuration, wiring or monitored cable.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter stops until the fault clears or is reset.
Resetting itself: when signal returns.
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. Check the harvi LED is blinking.
What the engineer will check
- Check CT clamp fully closed on cable, harvi terminals, pairing, channel.
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 30222379196689 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026