Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for YUTAKI SERIES
Uploaded: Nov. 21, 2025, 9:24 p.m.
Manual Publish Date: 2016-04-01
Warranty Information
No warranty information is available in the provided document.
YUTAKI units produce heating and domestic hot water, transforming renewable energy from the outside air into heat. They extract free energy from the air, enough to heat a home even on the coldest winter day. Every kW of electricity used can yield up to more than 5 kW of energy for heating, providing savings of up to 80% compared to traditional fossil fuel boilers. The new YUTAKI series offers outstanding performance in space heating and domestic hot water production. Cooling operation is also possible with a dedicated accessory. The system is controlled by a new user controller (PC-ARFHE) with enhanced functions.
The YUTAKI system can be configured for:
- Space heating: Mono-valent, Mono-energy, or Alternating Bi-valent systems.
- Domestic hot water production: Achieved using a domestic hot water tank.
- Space cooling: Possible with a dedicated "Cooling kit" accessory.
- Combination with solar panels: To heat DHW using solar energy.
- Swimming pool water heating: To heat pool water between 24 and 33°C.
Troubleshooting and error codes
| Alarm Code | Retry Stop Code | Yutaki S/SC | Yutaki S80 | Yutaki M | Origin | Detail of Abnormality | Main Factors |
|---|---|---|---|---|---|---|---|
| 3 | - | 0 | 0 | 0 | Communication | Transmission Alarm (Not outdoor unit detected) | Loose, disconnected, broken or short-circuited connector |
| 11 | - | 0 | 0 | 0 | Indoor | Water inlet thermistor abnormally (THMwi) | Loose, disconnected, broken or short-circuited connector |
| 12 | - | 0 | 0 | 0 | Indoor | Water outlet thermistor abnormally (THMwo) | Loose, disconnected, broken or short-circuited connector |
| 13 | - | 0 | 0 | 0 | Indoor | Indoor Liquid Pipe Temp Thermistor Abnormality (THMI) | Loose, disconnected, broken or short-circuited connector |
| 14 | - | 0 | 0 | 0 | Indoor | Indoor Gas Pipe Temperature Thermistor Abnormality (THMg) | Loose, disconnected, broken or short-circuited connector |
| 15 | - | (0) | (0) | (0) | Indoor | Water Circuit 2 thermistor abnormally (THMwo2) | Loose, disconnected, broken or short-circuited connector |
| 16 | - | (0) | (0) | (0) | Indoor | Water DHW thermistor abnormally (THMdhwt) | Loose, disconnected, broken or short-circuited connector |
| 17 | - | (0) | (0) | (0) | Indoor | Auxiliary sensor 2 thermistor abnormally (THMaux2) | Loose, disconnected, broken or short-circuited connector |
| 18 | - | (0) | (0) | (0) | Indoor | Auxiliary sensor 1 thermistor abnormally (THMaux1) | Loose, disconnected, broken or short-circuited connector |
| 19 | - | 0 | - | - | Indoor | Water Plate HEX pipe thermistor abnormally (THMwohp) | Loose, disconnected, broken or short-circuited connector |
| 23 | - | 0 | - | - | Indoor | Suction R134a pipe thermistor abnormally (THMs) | Loose, disconnected, broken or short-circuited connector |
| 25 | - | (0) | (0) | (0) | Indoor | Discharge R134a pipe thermistor abnormally (THMd) | Loose, disconnected, broken or short-circuited connector |
| 40 | - | 0 | 0 | 0 | Indoor | Incorrect LCD setting | Current LCD configuration does not allow proper operation |
| 63 | - | (0) | (0) | (0) | Communication | Transmission error between Central and indoor communication | Indoor fuse meltdown, Indoor/ central connection wiring (breaking, wiring error, etc.) |
| 70 | P70 | 0 | 0 | 0 | Indoor | Hydraulic alarm flow & Water Pump malfunction | Water flow is not detected in the hydraulic cycle or Pump defective |
| 83 | P83 | 0 | 0 | 0 | Indoor | Hydraulic alarm pressure | Water pressure is not detected in the hydraulic cycle |
| 72 | - | 0 | - | - | Indoor | Thermostat Heater Alarm | High temperature is detected in Electric Heater |
| 73 | - | 0 | 0 | 0 | Indoor | Mixing over-temperature limit protection for Mixed circuit. | Circuit 2 supply temperature > Target temperature + offset |
| 74 | P74 | 0 | 0 | 0 | Indoor | Unit over-temperature limit protection | Two > Tmax +5K |