FLA48200/FLA48300/FLA48500 and LUX-Y low-voltage LiFePO4 batteries (BMS fault code list)
Felicity C13 error code
Parallel failed: the battery could not establish parallel communication or balance with the other packs.
Likely causes
- Incorrect parallel wiring between packs
- DIP switch address duplicated or wrong
- Packs at different voltages before paralleling
- Communication cable missing or damaged
Checks to run, in order
- 1Check the parallel communication cables between packs
- 2Check each pack's DIP address is unique
- 3Measure each pack's voltage - the difference must be under 3 V before paralleling
- 4Complete the parallel installation before restarting
Fixes
- Correct the parallel wiring and DIP addresses
- Bring the packs within 3 V of each other
- Finish the parallel setup, then restart the unit
- If the problem remains, contact the installer
When to escalate
If the pack addresses and wiring are correct and C13 persists, escalate to the installer or 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 C13 mean?
Parallel failed: the battery could not establish parallel communication or balance with the other packs.
How do I fix Felicity C13?
Correct the parallel wiring and DIP addresses Bring the packs within 3 V of each other Finish the parallel setup, then restart the unit If the problem remains, contact the installer
When should I escalate Felicity C13?
If the pack addresses and wiring are correct and C13 persists, escalate to the installer or distributor.
Can I reset Felicity C13 myself?
Only after isolating the AC and DC sides and running the checks above. If Felicity C13 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Felicity C13?
Felicity C13 is documented for FLA48200/FLA48300/FLA48500 and LUX-Y low-voltage LiFePO4 batteries (BMS fault code list). 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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