Xantrex Freedom EX 4000 error code 21 (Relay(s) Welded - AC L1L2)
[F] Manual fault, shore (AC) mode: the AC L1L2 transfer relay is bad, or an AC source was wired directly to the AC output.
What to check, and in what order, is in the app. A step-by-step flow walks this code with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
Start free trial 14 days free, no card neededDocumented in
- Freedom EX 4000 Inverter/Charger with 48VDC-to-12VDC Converter Owner's Guide 975-0999-01-01 Rev F (May 2025)Xantrex LLC
Related codes
- 2 (AC Output Over Voltage)[E] Escalating auto fault, any mode: AC output over voltage. Must…
- 9 (BMS Node Missing for CVCC mode)[F] Manual fault, shore (AC) mode: the charger stage is set to CVCC…
- 17 / 19 (Relay(s) Welded - AC L1)[F] Manual fault, shore (AC) mode: the AC L1 transfer relay is bad…
- 18 / 20 (Relay(s) Welded - AC L2)[F] Manual fault, shore (AC) mode: the AC L2 transfer relay is bad…
- 22 (Relay(s) Welded)[F] Manual fault, shore (AC) mode: relay welded - same handling as…
- 41 (Auxiliary Power Supply Under Voltage Shutdown)[E] Escalating auto fault, any mode: internal auxiliary power supply…
- 42 (Auxiliary Power Supply Over Voltage Shutdown)[E] Escalating auto fault, any mode: internal auxiliary power supply…
- 44 (Battery Over Temperature Shutdown)[F] Manual fault, any mode: the battery temperature sensor reports…