Growatt Inverter Error Warning 400
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Growatt warning 400: Fan fault
Growatt warning 400 usually means the inverter has detected a cooling fan fault. The cooling fan helps regulate inverter temperature and protect internal components from overheating.
When this warning appears, your inverter may continue operating, but cooling performance may be reduced. If the fan fault is not resolved, the inverter may overheat, reduce output or shut down during warmer conditions.
This type of warning may be linked to a stuck fan, bearing issue, dust build-up, blocked airflow, fan power supply problem or another internal cooling fault.
Book a solar inverter check with e-Solar
If Growatt warning 400 appears, it is worth having the inverter inspected before heat-related performance problems become worse.
Our Perth-based solar team can inspect the inverter cooling system, check airflow and help determine whether the issue is linked to a faulty fan, obstruction, dust build-up, temperature sensor issue or internal power supply 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 or attempt to move internal fan components yourself. If the warning is persistent, a qualified technician may need to inspect the fan, cooling pathways and internal inverter components safely.
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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Growatt 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 Growatt inverter models. If your inverter is showing error code warning 400, 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 Growatt inverter support backed by local experience, honest advice and long-term solar care.