IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED)
Felicity 65 error code
Heatsink over-temperature fault: the inverter's internal temperature exceeded the safe operating threshold.
Likely causes
- High ambient temperature in the installation room
- Blocked cooling vents or a dust-clogged heatsink
- Failed cooling fan
- Inverter installed in direct sunlight or with insufficient 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 or obstruction
- 3Check that the fan runs when the unit is loaded
- 4Confirm the clearance around the unit and that it is not in direct sun
Fixes
- Clean the vents and heatsink
- Improve ventilation or shade the installation
- Switch the inverter off for 15 minutes, then restart
- Reduce the continuous load if the site is marginal
When to escalate
If code 65 returns quickly after a 15-minute cool-down with clear vents and a running fan, 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 65 mean?
Heatsink over-temperature fault: the inverter's internal temperature exceeded the safe operating threshold.
How do I fix Felicity 65?
Clean the vents and heatsink Improve ventilation or shade the installation Switch the inverter off for 15 minutes, then restart Reduce the continuous load if the site is marginal
When should I escalate Felicity 65?
If code 65 returns quickly after a 15-minute cool-down with clear vents and a running fan, escalate for fan or thermal-sensor service.
Can I reset Felicity 65 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 65 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 65?
Felicity 65 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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