Hitachi RAS-10FXG - 2.5 2-Way Cassette Type; 2.5.1 Removing Long Life Filter and Air Intake Grille; 2.5.2 Removing Electrical Box Cover

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TROUBLESHOOTING
 “RUN” light flickers and “ALARM” is indicated on the remote control switch.
 The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
 This alarm code is indicated when there are more than two (2) CH units connected between outdoor
unit and indoor unit due to incorrect wiring connection.
 This alarm code is indicated when the outdoor unit PCB (PCB1) for FSG/FS3 series is attached
incorrectly to the FXG/FX3 series outdoor unit.
Alarm
Code
Incorrect Wiring Connection (FX Series Only)
Is wiring connection
correct?
Yes
Is PCB1 for FXG/FX3
series?
Yes
Fault PCB for CH Unit
Correct the wiring connection
and start the unit again.
Outdoor Unit PCB is correct.
Outdoor Unit PCB is for FSG/FS3 series.
No
Replace the PCB1 with the
one for FXG/FX3 series and
start the unit again.
No
Correct Wiring
No. 1, 2
of TB2
No. 3, 4
of TB2
CH Unit
Indoor
Unit
Outdoor Unit
Indoor
Unit
CH Unit
No. 1, 2
of TB2
No. 3, 4
of TB2
Incorrect Wiring
No. 1, 2
of TB2
No. 3, 4
of TB2
Indoor
Unit
Outdoor Unit
Indoor
Unit
No. 1, 2
of TB2
No. 3, 4
of TB2
Incorrect Example;
Two (2) CH units between
outdoor unit and indoor unit
CH Unit
CH Unit