Manual for RAS-50FH7/RAC-50YH7

Manual for RAS-50FH7/RAC-50YH7

Brand: HITACHI

Category: Air Conditioner

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: Nov. 21, 2025, 6:27 p.m.

Manual Publish Date: 2010-01-01

Warranty Information

This manual does not contain specific warranty period information.

Indoor Unit Operations:

  • AUTO Mode: Automatically determines the operating mode (HEAT, COOL, DEHUMIDIFY) based on room temperature.
  • HEAT Mode: For heating when the outdoor temperature is below 21°C. Fan speed can be adjusted (AUTO, HI, MED, LOW, SILENT).
  • DEHUMIDIFY Mode: For dehumidifying when the room temperature is over 16°C. Fan speed is set to LOW or SILENT.
  • COOL Mode: For cooling when the outdoor temperature is -10°C to 43°C. Fan speed can be adjusted (AUTO, HI, MED, LOW, SILENT).
  • FAN Mode: Acts as an air circulator. Fan speed can be adjusted (HI, MED, LOW, SILENT).

Timer Functions:

  • OFF-Timer: Sets a time for the unit to turn off.
  • ON-Timer: Sets a time for the unit to turn on.
  • ON/OFF-Timer: Sets both an on and off time.
  • Sleep Timer: Turns the unit off after a designated number of hours and can be combined with an ON-timer.

Other Functions:

  • Auto Restart Control: Automatically restarts the unit with the previous settings after a power failure.
  • Temporary Switch: Allows operation when the remote controller is not working.

Troubleshooting and error codes

SELF-DIAGNOSIS LIGHTING MODE SELF-DIAGNOSIS RESULT REPAIR METHOD
1 TIME (LD301) ELECTRICAL OK CHANGE COMPRESSOR
2 TIMES (LD301) PEAK CURRENT CUT OFF CHANGE P.W.B.s
7 TIMES (LD301) COMPRESSOR CURRENT ABNORMAL IF COMPRESSOR CONNECTOR LOOSE OR NG - CHECK CONNECTOR CONDITION. IF COMPRESSOR CONNECTOR OK, CHECK COMPRESSOR, CHANGE P.W.B.s
10 TIMES (LD301) DC VOLTAGE ABNORMAL IF AC VOLTAGE INPUT ABNORMAL (OVER STANDARD VOLTAGE ±10%), FOLLOW STANDARD AC VOLTAGE INPUT. IF AC VOLTAGE INPUT IS NORMAL (WITHIN ±10%), CHANGE P.W.B.s
13 TIMES (LD301) EEPROM READING ERROR CHANGE P.W.B. MAIN
3 TIMES (LD301) Abnormal low speed rotation Compressor wire connector unplug, check wire continuity.
4 TIMES (LD301) Switching failure Compressor fail to start. Check wire continuity and disconnection connector.
5 TIMES (LD301) Overload lower limit cut Compressor load heavy causing operation stop.
6 TIMES (LD301) OH thermistor temperature rise Check if OH thermistor connector mis or half insert. Re-connect OH thermistor. Change OH thermistor.
7 TIMES (LD301) Thermistor abnormal Check if thermistor connector mis or half insert. Check if thermistor wire diconnect or short.
9 TIMES (LD301) Communication error Replace outdoor P.W.Bs if still cannot fix after review the cycle.
11 TIMES (LD301) Fan stop due to strong wind Wait till wind become weak then restart again the unit.
12 TIMES (LD301) Fan lock stop Fan motor abnormal. Replace fan motor. Replace outdoor P.W.B Main.
14 TIMES (LD301) ACT voltage abnormal RL3 or Q601 might be broken. Replace outdoor P.W.B Main. (RL3 or Q601 abnormal)
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