Growatt Inverter Error Code 101 / 102 / 121
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Growatt error 101 / 102 / 121: Communication error
Growatt error codes 101, 102 and 121 usually relate to communication faults inside the inverter. This may mean the inverter is having trouble communicating between internal components.
Error 101 generally means the main processor cannot communicate with the control panel or another internal processor.
Error 102 may mean the data received by internal processors does not match. This can sometimes occur when inverter components fail to synchronise correctly.
Error 121 generally means the main processor is not receiving data from another internal processor.
When this happens, your solar system may stop producing power, restart unexpectedly or fail to report data correctly through monitoring.
Let e-Solar inspect your inverter
If the code appears once and clears quickly, keep an eye on your system. The inverter may have recovered from a temporary communication issue.
If Growatt error code 101, 102 or 121 keeps returning, or your solar output has dropped, it is worth having the inverter checked. Internal communication faults should not be treated as a DIY fix.
Our Perth solar experts can inspect your inverter safely, review fault behaviour and help determine whether the issue is linked to internal communication, inverter hardware, firmware behaviour, grid instability or another system 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 electrical testing yourself. If the issue is persistent, a qualified technician may need to assess the inverter electronics, processor communication, firmware and system safety before recommending repair, warranty support or replacement.
Growatt error codes 101, 102 and 121 are commonly grouped as inverter communication errors. A restart may clear a temporary fault, but if the code returns, the system should be professionally assessed to determine whether there is an internal communication, hardware or control board issue.
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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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 101, 102 or 121, 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.
e-Solar supplies and supports a wide range of Growatt inverter systems across Perth, including hybrid and battery-ready models:
- Growatt MIN 5000TL-XH Grid Inverter
- Growatt MOD 5000TL3-X Grid Inverter
- Growatt SPH 5000 Grid Inverter (hybrid)
Trust e-Solar for reliable Growatt inverter support backed by local experience, honest advice and long-term solar care.