IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED); warning list uses 44 for low-voltage ride-through alarm
Felicity 44 error code
BUS voltage unbalance fault (solid LED): the positive and negative DC-bus halves drifted apart; in the warning list the same number is the low-voltage ride-through alarm raised during a grid dip (flashing LED).
Likely causes
- Internal DC-bus capacitor or regulation fault
- Grid voltage dip forcing low-voltage ride-through
- Heavy unbalanced load on the output
- Damage after a surge
Checks to run, in order
- 1Note whether the fault LED is solid (fault) or flashing (warning)
- 2If flashing, measure the grid voltage and confirm a dip or outage
- 3If solid, restart 2-3 times and check the load balance
- 4Inspect for signs of surge damage
Fixes
- For the warning, wait for the grid to recover
- For the fault, reduce the load and restart
- If the solid fault returns, remove the unit from service and book repair
When to escalate
A solid code 44 that returns with a stable grid and balanced load is an internal bus fault - escalate to the distributor.
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 44 mean?
BUS voltage unbalance fault (solid LED): the positive and negative DC-bus halves drifted apart; in the warning list the same number is the low-voltage ride-through alarm raised during a grid dip (flashing LED).
How do I fix Felicity 44?
For the warning, wait for the grid to recover For the fault, reduce the load and restart If the solid fault returns, remove the unit from service and book repair
When should I escalate Felicity 44?
A solid code 44 that returns with a stable grid and balanced load is an internal bus fault - escalate to the distributor.
Can I reset Felicity 44 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 44 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 44?
Felicity 44 is documented for IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED); warning list uses 44 for low-voltage ride-through alarm. 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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