IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED)
Felicity 54 error code
INV over-voltage fault: the inverter's AC output voltage exceeded its permitted range.
Likely causes
- Internal output-voltage regulation fault
- Sudden load rejection on the backup output
- Grid interaction or a faulty measurement circuit
- Output wiring or terminal fault
Checks to run, in order
- 1Measure the AC output voltage at the backup terminals with a true-RMS meter
- 2Check the output voltage setting and the connected load
- 3Restart the inverter 2-3 times as the manual directs
- 4Inspect output terminals and cabling for loose connections
Fixes
- Remove the load, restart and observe the output voltage
- Reconnect loads gradually and confirm the voltage stays in range
- If the voltage is high with no load, book service
When to escalate
If output voltage is outside range with no load connected, the inverter output stage needs distributor service.
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 Felicity 54 mean?
INV over-voltage fault: the inverter's AC output voltage exceeded its permitted range.
How do I fix Felicity 54?
Remove the load, restart and observe the output voltage Reconnect loads gradually and confirm the voltage stays in range If the voltage is high with no load, book service
When should I escalate Felicity 54?
If output voltage is outside range with no load connected, the inverter output stage needs distributor service.
Can I reset Felicity 54 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 54 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 54?
Felicity 54 is documented for IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED). Confirm the code on your own unit's display or manual before ordering parts.
More Felicity error codes
- Felicity 04Low cell voltage / over-discharge protection.
- Felicity 05PV over-current fault: the PV input current exceeded the inverter's PV input limit.
- Felicity 18PV short-circuit fault on the PV input; in the warning list the same number means battery under-voltage alarm.
- Felicity 19Battery open-circuit alarm: the inverter no longer detects a battery on its terminals.
- Felicity 20Battery SOC low alarm: the battery's state of charge has fallen to the low-SOC warning threshold.
- Felicity 21BMS communication alarm: abnormal communication between battery and inverter in non-SOC mode.
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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