IVGM5-8K LP2G1 hybrid inverters (warning code list, flashing fault LED)
Felicity 34 error code
Grid under-voltage alarm: grid voltage is below the inverter's permitted operating window.
Likely causes
- Weak or overloaded utility supply
- Undersized or long AC input cable causing voltage drop
- Loose AC input terminals
- Grid voltage window configured too narrow
Checks to run, in order
- 1Measure grid voltage at the inverter AC input
- 2Measure at the main distribution board under load
- 3Check AC input cable size, length and terminations
- 4Compare with the configured grid voltage window
Fixes
- Wait for the grid to recover
- Correct loose or undersized AC input wiring
- Only widen the window within safe limits and local rules
When to escalate
If the voltage is low only at the inverter while the board is healthy, escalate for input wiring and inverter inspection.
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 34 mean?
Grid under-voltage alarm: grid voltage is below the inverter's permitted operating window.
How do I fix Felicity 34?
Wait for the grid to recover Correct loose or undersized AC input wiring Only widen the window within safe limits and local rules
When should I escalate Felicity 34?
If the voltage is low only at the inverter while the board is healthy, escalate for input wiring and inverter inspection.
Can I reset Felicity 34 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 34 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 34?
Felicity 34 is documented for IVGM5-8K LP2G1 hybrid inverters (warning code list, flashing 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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