Solar Repairs: When to Call a Professional Instead of Restarting Everything
Restarting a solar inverter clears temporary faults — it does not fix water ingress, damaged DC wiring, failed string performance, or communication hardware issues, all of which require a licensed electrician or SAA-accredited solar professional to diagnose safely. Knowing which symptoms need professional attention saves money on problems that will reappear after the next power cycle.
- A restart clears software faults — it is the right first step for a single overnight shutdown with no error code. It does not diagnose hardware.
- Do not access the inverter's DC side, roof wiring, or panel connections yourself — DC solar wiring carries voltage even with the AC isolator off.
- Three symptoms that always need a professional: repeated shutdowns with the same error code; water or discolouration visible around the inverter; output significantly below what generation data shows it should be.
- Inverter replacements and panel work are licensed electrical work — not a plug-in swap.
What a household can safely do
The safe self-service steps are limited to the AC (grid) side of the system and the monitoring interface.
Safe for the household:
- Check the inverter display for an error code and note it (search the inverter manufacturer's fault code guide)
- Switch the inverter off via the AC isolator switch (the grey or red switch near the inverter — not the roof isolator) and restart after 5 minutes
- Check the app or monitoring dashboard for generation history — compare today's output to the same weather day last month
- Check whether the generation drop corresponds with new shading (tree growth, new structure on a neighbouring property)
- Reset the monitoring device (typically a Wi-Fi bridge) if the app shows no data but the inverter itself shows generation
Not safe for the household:
- Accessing the DC isolator on the roof or any roof-side wiring
- Opening the inverter casing
- Touching any wiring between the panels and the inverter
- Replacing fuses inside the inverter
Symptoms that need a professional
| Symptom | What it may indicate | Who to call |
|---|---|---|
| Same error code returns within 48 hours of restart | Inverter fault, grid voltage issue, or DC string problem | Licensed electrician or SAA-accredited solar professional |
| Inverter warm/hot to touch when not generating | Internal failure, ventilation blockage | SAA-accredited solar professional or inverter brand service agent |
| Water visible inside or around inverter | Ingress — can cause corrosion and fire risk | Licensed electrician immediately |
| Generation significantly below monitoring data | Panel damage, shading, string fault, MPPT issue | SAA-accredited solar professional with roof inspection |
| Error code referencing grid voltage | Utility grid issue or inverter voltage setting | Contact retailer first; then SAA-accredited solar professional |
| Monitoring shows zero for days, no error code | Monitoring hardware failure OR inverter in fault lockout | SAA-accredited solar professional |
When a repair becomes a replacement
Inverter lifespan varies by brand, age and operating conditions; panels are usually warranted for a much longer period. If an older inverter is failing, replacement may be more cost-effective than repair. Key considerations:
- Replacement inverter must be compatible with existing panels — capacity, string count and MPPT configuration need to match
- Grid connection approval (Section 5 or equivalent in your state) is required for a new inverter even on an existing system — the installer handles this, but confirm it is included in the quote
- Inverter replacement is a licensed electrical job — it involves reconnection to the switchboard and the grid connection isolation process
If the existing inverter is under warranty, contact the manufacturer's Australian warranty line first. Most brands (SolarEdge, Fronius, SMA, Goodwe, Sungrow) have Australian service processes — the SAA-accredited solar professional should handle warranty claims on your behalf.
Restart once, note the error code, and check the monitoring history. If the problem returns, if there is any sign of water, or if output has dropped significantly without an obvious cause, call an SAA-accredited solar professional for a roof and inverter inspection. Do not access any roof-side wiring or open the inverter casing yourself.
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