Hitachi UTOPIA RAS-4HVRP2E - Page 252

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
250
Alarm code
31
Incorrect capacity setting or combined capacity between indoor unit and outdoor
unit
• Thisalarmcodeisindicatedwhentheundened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
PCB set correctly?
Set the capacity for outdoor
unit PCB correctly.
No
Yes
Is DSW2 on the indoor unit PCB1
set correctly?
Set the capacity for indoor
unit PCB correctly.
No
Yes
Total capacity of the indoor
unit is wrong.
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Incorrect capacity setting of outdoor unit
Check capacity setting on
outdoor unit PCB.
Correctly set the dip switch, DSW3.
Incorrect capacity setting of indoor unit
Check capacity setting on
indoor unit PCB1.
Correctly set the dip switch, DSW2.
? NOTE
• 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.