MEGA 6/8/10/12 kW single-phase hybrid inverter — inverter fault
Beve 21 error code
Leakage current (GFCI) fault detected on the AC output.
Likely causes
- Earth leakage in fixed wiring or a connected appliance
- Moisture in an outdoor circuit, socket or junction box
- Neutral-to-earth bond on the backup output
- Inverter leakage current sensor fault
Checks to run, in order
- 1Disconnect all backup loads and restart the unit
- 2Insulation resistance test the AC circuits fed by the inverter
- 3Look for moisture in outdoor sockets and junction boxes
- 4Check for a neutral-to-earth bond downstream of the inverter
Fixes
- Repair or replace the leaking circuit or appliance
- Dry and reseal the wet enclosure
- Reconnect loads one at a time to confirm the fault is cleared
When to escalate
If code 21 trips with all loads disconnected and the wiring insulation tested good, the distributor should check the leakage sensor.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Beve 21 mean?
Leakage current (GFCI) fault detected on the AC output.
How do I fix Beve 21?
Repair or replace the leaking circuit or appliance Dry and reseal the wet enclosure Reconnect loads one at a time to confirm the fault is cleared
When should I escalate Beve 21?
If code 21 trips with all loads disconnected and the wiring insulation tested good, the distributor should check the leakage sensor.
Can I reset Beve 21 myself?
Only after isolating the AC and DC sides and running the checks above. If Beve 21 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Beve 21?
Beve 21 is documented for MEGA 6/8/10/12 kW single-phase hybrid inverter — inverter fault. Confirm the code on your own unit's display or manual before ordering parts.
More Beve error codes
- Beve 01Cooling fan is locked and not turning while the inverter is switched on.
- Beve 02Inverter temperature has exceeded its protection point.
- Beve 03Battery voltage is above the inverter's high battery cut-off.
- Beve 05Output short circuit detected on the inverter AC output.
- Beve 06Inverter output voltage is above the acceptable window; the manual's troubleshooting table puts this above 260 Vac.
- Beve 07Overload: the inverter has been running above its rating (102% in the manual's note) until the overload time expired.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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