Common Panasonic ECOi / PACi commercial VRF fault codes (as used in Panasonic FSV-EX systems), what they mean, and whether it's safe to reset or needs a professional.
Reviewed by Lim Eng Yew (Ryder Lim), Founder & Managing Director, RY Lim Electrical & Aircond Engineering · Last reviewed: September 2026
| Code | Meaning | Common Cause | Action |
|---|---|---|---|
| Sensor Faults (F-Series) | |||
| F01 | Indoor heat exchanger inlet temp sensor failure | Faulty or disconnected indoor sensor | Informational |
| F02 | Indoor heat exchanger freeze temp sensor failure | Faulty sensor — can affect freeze protection | Informational |
| F03 | Indoor heat exchanger outlet temp sensor failure | Faulty or disconnected indoor sensor | Informational |
| F04 | Outdoor discharge temperature sensor failure | Faulty compressor discharge sensor | Check First |
| F10 | Indoor inlet temperature sensor failure | Faulty room-side sensor | Informational |
| F11 | Indoor outlet temperature sensor failure | Faulty room-side sensor | Informational |
| F31 | Outdoor EEPROM error | Outdoor unit memory/board fault | Check First |
| Compressor Faults (H-Series) | |||
| H01 | Compressor overcurrent (Comp 1) | Electrical overload or compressor fault | Call Technician |
| H02 | Compressor locked rotor detected (Comp 1) | Mechanical seizure or electrical fault | Call Technician |
| H03 | No current detected on compressor (Comp 1) | Wiring fault or compressor failure | Call Technician |
| H05 | Discharge temperature not detected (Comp 1) | Faulty discharge thermistor | Check First |
| H06 | Low pressure trip | Refrigerant shortage or blocked piping | Call Technician |
| H07 | Low compressor oil level | Oil return issue or leak | Call Technician |
| H11 | Compressor overcurrent (Comp 2) | Electrical overload on second compressor (dual-compressor outdoor units) | Call Technician |
| H31 | Compressor IPM trip | Inverter power module over-temperature or over-current | Call Technician |
| Setting & System Codes (L-Series) | |||
| L01 | Indoor unit group setting error | Address/grouping conflict after installation or unit replacement | Informational |
H06 is a low pressure trip on the compressor circuit — usually caused by a refrigerant shortage or a blocked pipe. Treat it as a high-severity code: switch the system off and have it checked rather than repeatedly resetting.
Most F0-series codes are sensor faults (a thermistor reading incorrectly), which are usually not an emergency but do need attention — a faulty sensor can affect how the system protects itself. Not urgent, but worth booking a check rather than ignoring it.
No — Panasonic's commercial ECOi/PACi VRF systems use a different fault code scheme (F01–F31, H01–H31, L01) from residential split units, which use their own H/F/E numbering. This page covers the commercial VRF scheme.
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