Hitachi RAS-2-HVNP Service Manual page 238

8. Troubleshooting
31
Alarm code
• The RUN LED flickers 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 undefined setting is set to DSW3 on the outdoor unit PCB.
- This alarm code is indicated when the total indoor unit capacity is not equal to the combined outdoor unit capacity.
Outdoor unit capacity setting is not correct
Conditions:
Phenomenon
Incorrect Capacity Setting of Indoor Unit
Incorrect Capacity Setting of Outdoor Unit
Total Indoor Unit Capacity Connected to the Outdoor Unit is Beyond
Permissible Range
N O T E
• In case of H-LINK system, this alarm code is indicated when DSW4, RSW1 (for refrigerant system setting) on
the outdoor 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.)
224
SMGB0079 rev.0 - 01/2013
Incorrect Capacity Setting or Combined Capacity between Indoor Units and Outdoor Unit
Outdoor capacity
RAS-(2-2.5)HVNP / RAS-(3-12)H(V)NC(E)
RAS-(3-12)H(V)NP(E)
Cause
Total indoor unit
capacity of outdoor
unit capacity
80 ~ 120%
45 ~ 150%
Check item
Check combination of indoor units
and capacity setting on PCB.
Check capacity setting on outdoor
unit PCB.
Check outdoor unit model by
calculating total indoor units
capacity.
Action
(Turn OFF Main Switch)
Correctly set dip switch, DSW3.
Correctly set dip switch, DSW3.
Ensure that total indoor unit
capacity agrees with the above
capacity conditions.