IVGM5-8K LP2G1 hybrid inverters (warning code list, flashing fault LED)
Felicity 83 error code
Radiator over-temperature derating alarm: the inverter is reducing power because the heatsink temperature is too high.
Likely causes
- High ambient temperature
- Blocked or dusty cooling vents
- Failed or slow cooling fan
- Inverter in direct sunlight or with poor clearance
- Sustained operation near full load
Checks to run, in order
- 1Check the ambient temperature around the inverter
- 2Inspect the vents and heatsink for dust
- 3Confirm the fan runs and changes speed under load
- 4Check clearance and sun exposure
Fixes
- Clean the vents and heatsink
- Improve ventilation or shade the unit
- Reduce the continuous load until the temperature falls
When to escalate
If the derating alarm persists after cleaning and improving ventilation, escalate for fan or thermal-sensor 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 83 mean?
Radiator over-temperature derating alarm: the inverter is reducing power because the heatsink temperature is too high.
How do I fix Felicity 83?
Clean the vents and heatsink Improve ventilation or shade the unit Reduce the continuous load until the temperature falls
When should I escalate Felicity 83?
If the derating alarm persists after cleaning and improving ventilation, escalate for fan or thermal-sensor service.
Can I reset Felicity 83 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 83 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 83?
Felicity 83 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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