Solis Inverter Alarm: 1033
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Solis alarm 1033: Low PV insulation protection
Solis alarm code 1033 usually means the inverter has detected low insulation resistance on the solar panel side of the system. This indicates the PV system may not be sufficiently insulated from earth or ground.
Alarm code 1033 may appear as:
- PV ISO-PRO 01
- PV ISO-PRO 02
When this happens, the inverter may stop producing power or disconnect to protect the solar system.
This type of alarm can sometimes appear during early mornings, late afternoons or rainy weather when moisture increases and insulation resistance temporarily drops. If the alarm keeps returning, it may point to damaged DC cabling, poor connectors, ageing panels, moisture ingress, grounding issues or another insulation fault on the DC side of the system.
Let e-Solar check your inverter and PV insulation
If the alarm appears occasionally during wet or humid conditions and clears when the system dries out, the inverter may be responding to a temporary insulation drop.
If Solis alarm 1033 keeps returning, it is worth having the system checked. Our Perth solar team can inspect the inverter, test insulation resistance and help determine whether the issue is linked to moisture, damaged DC wiring, solar panel faults, connector issues or grounding problems.
Contact e-Solar and let us know:
- The exact error code on the screen or app
- When the code appears
- Whether your solar production has dropped
- Your inverter model, if you know it
Do not attempt to test PV insulation, disconnect DC wiring or inspect rooftop panels yourself. High-voltage solar systems require specialised equipment and training to diagnose safely. If the issue is persistent, a qualified technician may need to inspect the PV strings, AC wiring and DC cabling before restoring normal operation.
Get In Touch Today
Not sure what the error code means? Send us a quick message with a photo of your inverter screen. We’ll help identify the issue and guide you towards the safest next step.
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Solis Inverter Repairs and Fault Support
We understand that every solar system is different, which is why our repair and fault-finding services cover a wide range of Solis inverter models. If your inverter is showing error code 1033, our experienced technicians can help determine whether the issue is linked to grid voltage, inverter settings, site wiring or wider network conditions.
With over 22 years supporting Perth solar systems, e-Solar has seen all kinds of inverter faults and performance issues. We’ll assess your system safely, explain what the code means, and recommend the right next step to help get your solar running properly again.
Trust e-Solar for reliable Solis inverter support backed by local experience, honest advice and long-term solar care.