Hitachi UTOPIA RAS-4HVRP2E Service Manual page 282

10 Troubleshooting
Troubleshooting procedure
31
Alarm code
• The alarm code is flashed on the 7-segment display of the outdoor unit.
• The alarm code is displayed on the wired controller of the indoor unit.
This alarm code is displayed when an undefined setting is set to DSW3 (for capacity and power supply setting) on the
service board or O.U.PCB (4~6HP).
This alarm code is displayed when the total indoor unit capacity is outside the range of connectable indoor unit capacity
ratio.
Outdoor Unit Model
4HP ~ 6HP
Is DSW3 of outdoor unit set
incorrectly?
No
Is DSW3 on Indoor Unit PCB set
incorrectly?
No
Are the setting of DSW4 and
RSW1 on Outdoor Unit and
setting of DSW5 and RSW2 on
Indoor Unit PCB totally same in a
refrigerant system?
Yes
Total Indoor Unit capacity is wrong
Phenomenon
Incorrect Capacity Setting of Indoor Unit
Incorrect Capacity Setting of Outdoor Unit
Total Indoor Unit Capacity Connected to Outdoor Unit is Beyond
Permissible Range
Refrigerant System Setting of Outdoor Unit and Indoor Unit is Different
280 SMGB0136 rev.0 - 07/2021
Incorrect Capacity Setting of Outdoor Unit and Indoor Unit
Connectable Indoor Unit Capacity
Connectable Indoor Unit Capacity Ratio
Minimum
45%
Yes
Yes
No
Cause
Set capacity of Indoor Unit PCB
Check Item
Check combination of Indoor
Units and capacity setting of
Indoor Unit PCB
Check capacity setting of
Outdoor Unit
Check Outdoor Unit model by
calculating total Indoor Units
capacity
Check refrigerant system setting
of Outdoor Unit and Indoor Unit
PCB
Maximum
150%
Set capacity correctly
Set them correctly
Outdoor Unit: DSW4, RSW1
Indoor Unit: DSW5, RSW2
Action (Turn OFF
Main Switch)
Correctly set DIP switch, DSW3
Correctly set DIP switch, DSW3
Ensure the total Indoor Unit
capacity
Set them correctly