Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for HI-MULTI / SET-FREE 5-30HP FSN(E)/FXN(E)
Uploaded: Nov. 21, 2025, 6:41 p.m.
Warranty Information
Refer to the manual for specific warranty details as not explicitly stated in this section.
1. SAFETY SUMMARY
- DANGER: Do not pour water into the indoor or outdoor unit. These products are equipped with electrical parts. If water contacts with electrical components then it will cause a serious electrical shock.
- WARNING: Do not use any sprays such as insecticide, lacquer, hair spray or other flammable gases within approximately one (1) meter from the system.
- CAUTION: Refrigerant leakage can cause difficulty with breathing due to insufficient air.
- Verify installation information for completeness and contact your distributor if any information is missing.
- HITACHI reserves the right to vary specifications without notice due to continuous product improvement.
- This air conditioner is designed for standard air conditioning for human beings only.
- No part of this manual may be reproduced without written permission.
- Temperature operating range: Cooling: Indoor 32°C DB/23°C WB (Max) to 21°C DB/15°C WB (Min); Outdoor 43°C DB (Max) to -5°C DB (Min). Heating: Indoor 27°C DB (Max) to 15°C DB (Min); Outdoor 15°C WB (Max) to -20°C WB (Min).
Troubleshooting and error codes
| Code | Category | Anomaly | Main Cause |
|---|---|---|---|
| 01 | Indoor Unit | Protection Device Trip | Fan Motor, Drain Outlet, PCB, Relay Trip |
| 02 | Outdoor Unit | Protection Device Trip | PSH Activation |
| 03 | Transmission | Anomaly between Indoor (or Outdoor) and Outdoor (or Indoor) | Incorrect Wiring. PCB Disconnection. Fuse Activation. Power OFF |
| 04 | Inverter | Transmission Disconnection between Control PCB | Inverter Controller and Control PCB Transmission Anomaly |
| 04 | Transmission | Power Circuit Anomaly | Incorrect Wiring - Phase Reversal |
| 05 | Transmission | Power Circuit Anomaly | Incorrect Wiring - Phase Reversal |
| 06 | Voltage Drop | Voltage Drop due to excessively low or high voltage to the Outdoor Unit | Power Supply Voltage Drop. Incorrect Wiring or Insufficient Power Supply Wiring Capacity. |
| 07 | Outlet Gas Temperature Drop | Excessive Refrigerant Charge. Expansion Valve Open. | |
| 08 | Outlet Gas Temperature Rise | Insufficient Refrigerant Amount. Refrigerant Leakage, Clogged or Closed Expansion Valve. | |
| 09 | Outdoor Unit | Protection Device Trip | Fan Motor Trip |
| 11 | Air Inlet Thermistor | Thermistor, Sensor, Connection Trip. | |
| 12 | Air Outlet Thermistor | Thermistor, Sensor, Connection Trip. | |
| 13 | Anti-freeze Protection Thermistor | Thermistor, Sensor, Connection Trip. | |
| 14 | Gas Pipe Thermistor | Thermistor, Sensor, Connection Trip. | |
| 19 | Motor Protection Device | Fan Motor Trip. | |
| 21 | High Pressure Sensor | High Pressure Sensor Trip. | Compressor, Inverter Trip |
| 22 | Outdoor Air Thermistor | Outdoor Air Thermistor Trip. | Compressor, Inverter Trip |
| 23 | Evaporator Thermistor | Evaporator Thermistor Trip. | Compressor, Inverter Trip |
| 24 | Gas Pipe Thermistor | Gas Pipe Thermistor Trip. | Compressor, Inverter Trip |
| 29 | Liquid Pressure Sensor | Liquid Pressure Sensor Trip. | Compressor, Inverter Trip |
| 30 | Sensor | Low Pressure Sensor Trip. | Compressor, Inverter Trip |
| 31 | Outdoor Unit | Incorrect Wiring Connection. | Incorrect wiring between Outdoor Unit, CH Unit and Indoor Units. |
| 32 | Incorrect Setting of Outdoor and Indoor Units | Incorrect Capacity Code Setting. | |
| 35 | Transmission Anomaly of Another Indoor Unit | Power Supply Disconnection, PCB on another Indoor Unit. Disconnection of another Indoor Unit in the same Refrigerant Cycle. | |
| 36 | Incorrect Setting in Indoor Unit No. | Same Indoor Unit No. exists in the same Refrigerant Cycle. | |
| 38 | Incorrect Indoor Unit Type | Indoor Unit is not suitable for R410A. | |
| 39 | Protection Circuit Anomaly in Outdoor Unit | Indoor Unit PCB Disconnection. Incorrect Wiring. Connection to Indoor Unit PCB. | |
| 43 | Operating Current Anomaly during Continuous Compressor Operation | Overcurrent, Burned Fuse of Current Sensor. | |
| 44 | Pressure | Low Pressure Ratio Protection Activation | Compressor, Inverter Trip. Overload of Indoor Unit in Cooling. High Outdoor Air Temperature in Heating. Expansion Valve Open. Overload Operation. Excessive Refrigerant Quantity. Heat Exchanger is Clogged. |
| 45 | High Pressure Ratio Protection Activation | Insufficient Refrigerant Quantity. | |
| 46 | High Pressure Ratio Protection Activation | Insufficient Refrigerant Quantity. | |
| 47 | Low Pressure Ratio Protection Activation | Insufficient Refrigerant Quantity. | |
| 51 | Inverter | Current Sensor Anomaly for Inverter | Inverter PCB Sensor Disconnection. |
| 52 | Protection Device Activation | Overcurrent, Overload, Compressor Lock. | Overcurrent, Overload, Compressor Lock. |
| 53 | IPM Protection Activation | IPM Automatic Stop (Overcurrent, Low Voltage or Overheating). | |
| 54 | Inverter Fan Temperature Rise | Inverter Fan Thermistor Anomaly. | Inverter Fan Thermistor Anomaly. |
| 56 | Outdoor Fan | Motor Detection Circuit Anomaly | Transmission Detection Circuit Anomaly. |
| 57 | Fan Controller Activation | Fan Controller Activation. | |
| 58 | EE | Inverter Protection | Fan Speed Anomaly. Overcurrent, Fan Controller Anomaly. |