Solar · Error codes · Shenzhen SOFARSOLAR Co., Ltd.
ID042Shenzhen SOFARSOLAR Co., Ltd. · SOFAR HYD 3000-6000-EP
ID042 on a Shenzhen SOFARSOLAR Co., Ltd. SOFAR HYD 3000-6000-EP: Low insulation impedance
Short answer
On a Shenzhen SOFARSOLAR Co., Ltd. inverter, ID042 means: Low insulation impedance. 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: Low insulation impedance.
Part involved: IsoFault.
Likely causes:
- Check insulation resistance PV array-earth; repair any short circuit.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: unknown.
Manual reset: See checks.
What you can check
- Read the ID code and name on the inverter LCD (Event List) or in the SOFAR/SolarMAN app and note it for your installer.
- Do not touch panels/DC cables; contact installer.
What the engineer will check
- Insulation test; repair.
Who to ask for: Sofar-trained PV/battery installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- HYD 3000/5000/6000-EP User Manual ↗ · sofarsolar.com upload 2024-12-27 · page 83 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026