Solar · Error codes · Fox ESS
Over Load FaultFox ESS · H1 G2 single-phase hybrid inverter
Over Load Fault on a Fox ESS H1 G2 single-phase hybrid inverter: Over load in on grid mode
Short answer
On a Fox ESS inverter, Over Load Fault means: Over load in on grid mode. The inverter keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Over load in on grid mode.
Part involved: inverter output.
When it shows: Load above rating.
Likely causes:
- Load power exceeds inverter limit in grid-tied mode.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter keeps running with some functions stopped.
Resetting itself: unknown.
Manual reset: Check load; seek help if persists.
What you can check
- Read the full code and message on the inverter screen or in the FoxCloud app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
- Note which large appliances were running when the code appeared.
What the engineer will check
- Check load profile and CT/load wiring; review backup circuit design.
Who to ask for: Qualified electrician / MCS PV installer.
Certification: Battery and hybrid-inverter DC work: installer trained/approved by the manufacturer; electrical work under BS 7671 by a competent person.
What you might notice
Sources
- H1(G2)/AC1(G2) Series User Manual ↗ · V1.0.8 · page 48 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026