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4-8myenergi · eddi solar immersion diverter

4-8 on a myenergi eddi solar immersion diverter: Load Fault - heater element or wiring faulty

Short answer

On a myenergi inverter, 4-8 means: Load Fault - heater element or wiring faulty. 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: Load Fault - heater element or wiring faulty.

Likely causes:

  • Faulty element/wiring (resistance outside 15-350 ohm).

Is it safe?

Does the inverter stop?Yes
SeverityFault — 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 repair.

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

  • Isolate; measure L1-N and L2-N heater resistance (15-350 ohm).

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

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 24 September 2026