Hitachi UTOPIA RAS-4HVRP2E Service Manual page 252

10 Troubleshooting
Troubleshooting procedure
31
Alarm code
• This alarm code is indicated when the undefined setting is set to DSW3 on the outdoor unit PCB or to DSW2 on
indoor unit PCB1.
• 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.
• Outdoor unit capacity setting is not correct
• This alarm forces all operations to stop (Outdoor & Indoor Units).
• The unit should be stopped to release the alarm.
Is DSW3 on the outdoor unit
Is DSW2 on the indoor unit PCB1
Total capacity of the indoor
Phenomenon
Incorrect capacity setting of outdoor unit
Incorrect capacity setting of indoor unit
?
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.
250 SMGB0136 rev.0 - 07/2021
Incorrect capacity setting or combined capacity between indoor unit and outdoor
unit
PCB set correctly?
Yes
set correctly?
Yes
unit is wrong.
Cause
No
Set the capacity for outdoor
unit PCB correctly.
No
Set the capacity for indoor
unit PCB correctly.
Check item
Check capacity setting on
outdoor unit PCB.
Check capacity setting on
indoor unit PCB1.
Action
(Turn OFF the main switch)
Correctly set the dip switch, DSW3.
Correctly set the dip switch, DSW2.