Solar · Error codes
What do eddi fault codes (4)1 to (4)8 mean?
Short answer
eddi fault codes point to the immersion side: (4)1 heater load above 16 A, (4)2 overheating, (4)3 no signal from the harvi, (4)4 grid sensor wrongly fitted, (4)5 back-feed voltage, (4)6/(4)7 supply voltage and (4)8 faulty heater element. Only (4)2 and (4)3 have simple owner checks; others need an electrician. Checked 24 September 2026.
Last checked 24 September 2026 · 1 source
In more detail
- Each heater output is limited to 3.7 kW (16 A)
- (4)8 element resistance should be 15-350 ohms (electrician test)
- (4)5 back-feed: switch off and call an electrician
The facts, dated
- 01eddi maximum load per heater output — 3.7 kW
manufacturer · n/a · checked 24 September 2026 · support.myenergi.com
Sources
- support.myenergi.com — support.myenergi.com/hc/en-gb/articles/30222350920721-Fault-Code-4-1-Output-Over…
Last checked: 24 September 2026