IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED)
Felicity 28 error code
Battery hardware over-current: the battery port's hardware protection tripped on an instantaneous over-current.
Likely causes
- Short or near-short on the battery circuit
- Reverse-connected battery polarity
- Fast current surge from the battery or inverter power stage
- Internal hardware fault on the battery port
Checks to run, in order
- 1Inspect the battery cables and terminals for a short or reverse polarity
- 2Measure the battery voltage and check it against the inverter specification
- 3Restart the inverter 2-3 times and note whether the code returns at once
- 4Check for a conductive object or damaged insulation on the battery circuit
Fixes
- Repair or replace the shorted battery cable
- Correct the polarity and reconnect the battery
- Restart; if the fault returns with sound wiring, book service
When to escalate
If code 28 returns immediately with the battery wiring sound and the polarity correct, the battery port hardware has failed - 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 28 mean?
Battery hardware over-current: the battery port's hardware protection tripped on an instantaneous over-current.
How do I fix Felicity 28?
Repair or replace the shorted battery cable Correct the polarity and reconnect the battery Restart; if the fault returns with sound wiring, book service
When should I escalate Felicity 28?
If code 28 returns immediately with the battery wiring sound and the polarity correct, the battery port hardware has failed - escalate to the distributor.
Can I reset Felicity 28 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 28 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 28?
Felicity 28 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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