IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED)
Felicity 85 error code
External CT sensor fault: the external current transformer is not giving a usable reading.
Likely causes
- CT not connected or plugged into the wrong port
- CT clamped on the wrong conductor or facing the wrong way
- Damaged CT cable or connector
- CT ratio or meter setting incorrect
Checks to run, in order
- 1Check that the CT is firmly connected to the inverter's CT port
- 2Confirm the CT is on the correct conductor and arrow direction
- 3Inspect the CT cable and connector for damage
- 4Check the CT ratio and meter setting
Fixes
- Reseat or replace the CT cable
- Refit the CT on the correct conductor in the right direction
- Correct the CT ratio setting, then restart
When to escalate
If code 85 persists with a known-good CT and correct settings, escalate for meter/CT-port 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 85 mean?
External CT sensor fault: the external current transformer is not giving a usable reading.
How do I fix Felicity 85?
Reseat or replace the CT cable Refit the CT on the correct conductor in the right direction Correct the CT ratio setting, then restart
When should I escalate Felicity 85?
If code 85 persists with a known-good CT and correct settings, escalate for meter/CT-port service.
Can I reset Felicity 85 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 85 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 85?
Felicity 85 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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