iStore Inverter Alarm 2003
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iStore error 2003: DC arc fault
iStore alarm 2003 usually means the inverter has detected a DC arc fault within the solar array. This can happen when PV string cables are arcing, damaged, loose or making poor electrical contact.
The alarm may relate to PV1, PV2 or PV3, depending on which solar string has triggered the fault.
A DC arc occurs when electricity jumps across a gap in a connection rather than flowing through a secure electrical path. This can generate significant heat and is treated as a serious safety issue by modern solar inverters.
Possible causes include loose DC connectors, damaged cabling, deteriorated connections, faulty MC4 connectors, poor installation practices or physical damage to the solar wiring.
Contact e-Solar before resetting the system
If iStore alarm 2003 appears, do not ignore the warning or repeatedly reset the inverter without understanding the cause.
Our Perth-based solar team can inspect the inverter, DC cabling and solar strings to help determine whether the issue is linked to damaged connectors, loose wiring, faulty components or another DC-side fault.
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 open the inverter, disconnect DC connectors or inspect rooftop solar wiring yourself. DC arc faults can present a serious electrical and fire risk. If the alarm is persistent, a qualified technician may need to inspect the solar strings, test connections and identify the source of the fault before the system can safely return to operation.
If you’re unsure, don’t risk it. Contact e-Solar for safe, local support.
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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iStore 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 iStore inverter models. If your inverter is showing error code 2003, 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 iStore inverter support backed by local experience, honest advice and long-term solar care.