Hitachi RAS-(4-12)HNP(1)(E) - Incorrect Capacity Setting or Combined Capacity between Indoor Units and Outdoor Unit

8 Troubleshooting
251
SMGB0087 rev.0 - 12/2013
8
Alarm code
31
Incorrect Capacity Setting or Combined Capacity between Indoor Units and Outdoor Unit
• The RUN LED ickers and “ALARM” is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- This alarm code is indicated when the undened setting is set to DSW3 on the outdoor unit PCB.
- This alarm code is indicated when the total indoor unit capacity is outside the range allowed of the combined out-
door unit capacity.
- Outdoor unit capacity setting is not correct
Is DSW3 on the outdoor unit
PCB1 set correctly?
Set the capacity for PCB1
No
Yes
Is DSW3 on the indoor unit
PCB set correctly?
Set the capacity for PCB
No
Yes
Total capacity of the indoor
unit(s) is wrong
Phenomenon Cause Check item
Action
(Turn OFF Main Switch)
Incorrect Capacity Setting of Indoor Unit
Check combination of indoor
units and capacity setting on
PCB.
Correctly set dip switch, DSW3.
Incorrect Capacity Setting of Outdoor Unit
Check capacity setting on
outdoor unit PCB.
Correctly set dip switch, DSW3.
Total Indoor Unit Capacity Connected to the Outdoor Unit is Be-
yond Permissible Range
Check outdoor unit model by
calculating total indoor units
capacity.
Ensure that total indoor unit
capacity agrees with the above
capacity conditions.
N O T E
• In case of H-LINK system, this alarm code is indicated when DSW4, RSW1 (for refrigerant system setting) on the out-
door unit PCB and DSW5, RSW2 (for refrigerant system setting) on the indoor unit PCB are incorrectly set.
• In this case, set correctly DSW4, RSW1, DSW5 and RSW2 after turning OFF main switch.
• (RSW2 is not equipped with some models.)