Battery disconnected
Also displayed as F27 on some models.
Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.
The exact meaning depends on your model:
Also applies to:IVPS5048P1G1-LVIVPS7548P2G1IVPS10048P2G1IVPS3.5~10kVA-USIVPS3-5-10KVA
Battery disconnected — The battery is disconnected from the inverter.
Cause: The battery connector is loose or disconnected.
Check the battery connector.
Source: ivps3524p1g1-lv-ivps5048p1g1-lv-ivps7548p2g1-ivps10048p2g1-manual.pdf, p.24
Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1
Battery over Current fault
Cause: Current into or out of the battery exceeded the software protection limit, so the inverter tripped to protect the pack and its own power stage.
Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.53
Also applies to:IVEM6048
The AC input and output wires are inversely connected
Cause: AC input and output wires are reversed.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.38
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
The AC input and output wires are inversely connected
Cause: AC input and output wires connected reversely.
Source: IVEM8K-12K-II_compressed.pdf, p.44
Also applies to:IVEM8048
The AC input and output wires are inversely connected
Cause: AC input and output wiring reversed, possibly during parallel installation.
Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.39
Battery 2 relay open circuit fault — Battery 2 relay not closing properly causing open circuit, shutdown and restart.
Cause: A safety relay inside the inverter has failed self-test or is stuck. The inverter is designed to refuse grid connection in this state, so this is not an issue you can clear with restart cycles.
Source: t-rex-25-50khp3g01-user-guide-en.pdf, p.46
It depends on the model — 6 devices use code 27. On the IVPS3524P1G1-LV it means: Battery disconnected. The card for each model on this page gives its exact meaning and fix.
27 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
Check the battery connector. The exact steps for each affected model are listed on this page.
Prefer the full written guide? Read the complete Felicity inverter error-code guide
Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.