Hitachi RAS-5HVRNM1E Service Manual page 256

8 Troubleshooting
35
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, alarm code and unit model code appear alternately on the Set Temperature display of the remote
control switch. The alarm code also appears on the outdoor unit PCB display.
– The alarm code appears three minutes after the outdoor unit power activation if duplication is detected in indoor unit
numbers connected to an outdoor unit (one refrigerant system). This applies when indoor unit numbers are
configured using the rotary switch (RSW1).
– The alarm code appears when five or more indoor units are connected to one outdoor unit.
– The alarm code appears when the indoor and outdoor unit refrigerant system and address are set to 64 or above.
(In such a case, the alarm code "b1" appears on the remote control switch.)
N O T E
The alarm code may appear when H-LINK system is employed for indoor–outdoor unit transmission, if there is any
incorrect setting in DSW4/RSW1 on the outdoor unit PCB and DSW5/RSW2 on the indoor unit PCB; which are dip
switches used for refrigerant system setting. In such a case, turn OFF the power and correctly set DSW4/RSW1 on
the outdoor unit PCB and DSW5/RSW2 on the indoor unit PCB before reactivating the power.
(Some indoor unit models do not have RSW2.)
248
SMGB0060 rev. 1- 12/2010
Incorrect Indoor number setting