IE031 on a Tigo Energy Tigo EI Inverter: Grid Relay Fault (Electrical Relay Failure). Tigo suggestion: Disconnect PV, grid and batteries then reconnect
Short answer
On a Tigo Energy inverter, IE031 means: Grid Relay Fault (Electrical Relay Failure). Tigo suggestion: Disconnect PV, grid and batteries then reconnect. 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 Relay Fault (Electrical Relay Failure). Tigo suggestion: Disconnect PV, grid and batteries then reconnect.
Likely causes:
- Electrical Relay Failure.
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: unknown.
Manual reset: unknown.
What you can check
- Read the code on the inverter display / EI app.
- Consult your installer (Tigo: only qualified people should perform the listed actions).
What the engineer will check
- Disconnect PV, grid and batteries then reconnect.
- Escalate to Tigo Support if persists.
Who to ask for: PV / hybrid inverter.
Certification: MCS PV installer; Tigo-trained installer; electrical work to BS 7671.
What you might notice
Sources
- EI Inverter (EU) - Fault, Warning and Error Codes ↗ · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026