Brand: HITACHI
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for RAC-35WPC RAC-50WPC
Uploaded: Nov. 21, 2025, 8:31 p.m.
The manual provides detailed information for servicing HITACHI RAC-35WPC and RAC-50WPC air conditioning units. It covers safety precautions during repair work, working standards for preventing semiconductor damage, specifications, installation figures, construction and dimensional diagrams, main parts components, compressor motor details, wiring diagrams, block diagrams, refrigerating cycle diagrams, and procedures for disassembly and reassembly. It also includes descriptions of main circuit operations, power circuits (high and low voltage), P.W.B. for power circuit specifications, and troubleshooting guides based on LED blinking codes and operating conditions. Finally, it outlines how to run the outdoor unit independently and provides parts lists and diagrams for both models.
Troubleshooting and error codes
| LED Blinking Code | Troubleshooting Steps | Action |
|---|---|---|
| LD301 blinks 13 times | EEPROM reading error | Replace the outdoor electrical parts (in the case of an abnormality in the microcomputer or EEPROM). |
| LD301 blinks 9 times | Communication error | Correct the F cable connection. |
| LD301 blinks 1 time | Reset stopped | If the product runs normally, check indoor electrical parts. If it stops, identify the failure location. |
| LD301 blinks 10 times | Power supply voltage error | Check AC 220-230V between terminals L and N. If abnormal, check the power supply and reactor. |
| LD301 blinks 7 times | Thermistor abnormality | Check for loose or poorly inserted thermistors. Check for wire breaks and short-circuits. |
| LD301 blinks 6 times | OH thermistor rise | Check if the OH thermistor is not loose or poorly inserted. Check for wire breaks and short-circuits. |
| LD301 blinks 16 times | High load stop | Review the freezing cycle (refrigerant leakage or other reasons). |
| LD301 blinks 5 times | Overload lower limit cut | Check if the outdoor unit heat exchanger is clogged up, or if there is shelter around. Clear the causation. |
| LD301 blinks 4 times | Switchover failure | This is a failure in starting up the compressor. Check compressor connectors for looseness and continuity. |
| LD301 blinks 3 times | Abnormally slow rotation | The product detected an abnormality in the control of the compressor. Check compressor for loose connectors and cord continuity. |
| LD301 blinks twice | Peak current cut | Check the compressor for loose connectors and cord continuity. Confirm insulation of the compressor. |
| LD301 blinks 14 times | Active voltage abnormal | Check if the creepage breaker is set. Check compressor insulation. |
| LD301 blinks 12 times | Fan lock stopped | Check if the fan is clear of foreign matter and abnormalities. Check the fan motor for loose connectors. |
| LD301 blinks 11 times | Fan stopped due to a strong wind | This is a pause due to a strong wind. The product will start again as the wind weakens. |