IVGM5-8K LP2G1 hybrid inverters (fault code list, solid fault LED)
Felicity 90 error code
Parallel host lost: the master inverter in the parallel system is not responding.
Likely causes
- Master inverter powered down or faulted
- Parallel communication cable from the master damaged
- Master/slave role changed
- Address conflict
Checks to run, in order
- 1Confirm the master inverter is powered and fault-free
- 2Check the communication cable from the master to each slave
- 3Confirm the master/slave settings on every unit
- 4Check for duplicate addresses
Fixes
- Restore power to the master and clear its fault
- Repair the communication cable
- Correct the master/slave roles and restart the group
When to escalate
If the master is healthy and cabled correctly but code 90 persists, escalate for parallel communication 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 90 mean?
Parallel host lost: the master inverter in the parallel system is not responding.
How do I fix Felicity 90?
Restore power to the master and clear its fault Repair the communication cable Correct the master/slave roles and restart the group
When should I escalate Felicity 90?
If the master is healthy and cabled correctly but code 90 persists, escalate for parallel communication service.
Can I reset Felicity 90 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity 90 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity 90?
Felicity 90 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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