Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for RAK-18WPB/RAC-18WPB
Uploaded: Nov. 21, 2025, 7:03 p.m.
Warranty Information
Consult the manual for specific warranty information as it is not provided in the document.
Remote Controller Operation:
- Preparation: Install batteries, and optionally mount the remote controller holder.
- Basic Functions: Set calendar and clock. Use START/STOP to begin/end operation. Adjust room temperature and fan speed (AUTO, HIGH, MED, LOW, SILENT).
- Modes: Select AUTO, HEAT, DEHUMIDIFY, COOL, or FAN modes.
- Special Functions: Utilize POWERFUL, ECO, SILENT, LEAVE HOME, CLEAN (One Touch Clean), ON/OFF TIMER, ECO SLEEP TIMER, and WEEKLY TIMER for enhanced control and energy saving.
- Auto Restart: The unit can automatically restart with the previous settings after a power failure.
- INFO Function: Check ambient temperature and monthly power consumption.
Outdoor Unit Test Switch: Allows running the outdoor unit independently for testing purposes.
Independent Outdoor Unit Operation: Procedure for running the outdoor unit without the indoor unit, including refrigerant charging and parts preparation.
Troubleshooting and error codes
| ERROR CODE | POSSIBLE CAUSE | REMEDY |
|---|---|---|
| 11 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 12 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 13 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 14 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 15 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 16 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 17 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 18 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 19 | Outdoor unit fan motor abnormalities. | Check outdoor unit fan motor. |
| 21 | Compressor abnormalities. | Check compressor. |
| 22 | Compressor abnormalities. | Check compressor. |
| 23 | Compressor abnormalities. | Check compressor. |
| 24 | Compressor abnormalities. | Check compressor. |
| 25 | Compressor abnormalities. | Check compressor. |
| 26 | Compressor abnormalities. | Check compressor. |
| 27 | Compressor abnormalities. | Check compressor. |
| 28 | Compressor abnormalities. | Check compressor. |
| 29 | Compressor abnormalities. | Check compressor. |
| 31 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 32 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 33 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 34 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 35 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 36 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 37 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 38 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 39 | Outdoor unit temperature sensor abnormalities. | Check outdoor unit temperature sensor. |
| 41 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 42 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 43 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 44 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 45 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 46 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 47 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 48 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 49 | Outdoor unit thermistor abnormalities. | Check outdoor unit thermistor. |
| 51 | Communication error between indoor and outdoor units. | Check communication line. |
| 52 | Communication error between indoor and outdoor units. | Check communication line. |
| 53 | Communication error between indoor and outdoor units. | Check communication line. |
| 54 | Communication error between indoor and outdoor units. | Check communication line. |
| 55 | Communication error between indoor and outdoor units. | Check communication line. |
| 56 | Communication error between indoor and outdoor units. | Check communication line. |
| 57 | Communication error between indoor and outdoor units. | Check communication line. |
| 58 | Communication error between indoor and outdoor units. | Check communication line. |
| 59 | Communication error between indoor and outdoor units. | Check communication line. |
| 61 | Indoor unit abnormalities. | Check indoor unit. |
| 62 | Indoor unit abnormalities. | Check indoor unit. |
| 63 | Indoor unit abnormalities. | Check indoor unit. |
| 64 | Indoor unit abnormalities. | Check indoor unit. |
| 65 | Indoor unit abnormalities. | Check indoor unit. |
| 66 | Indoor unit abnormalities. | Check indoor unit. |
| 67 | Indoor unit abnormalities. | Check indoor unit. |
| 68 | Indoor unit abnormalities. | Check indoor unit. |
| 69 | Indoor unit abnormalities. | Check indoor unit. |
| 71 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 72 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 73 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 74 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 75 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 76 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 77 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 78 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |
| 79 | Refrigerant circuit abnormalities. | Check refrigerant circuit. |