Hitachi UTOPIA RAS-4HVRP2E Service Manual page 283

10 Troubleshooting
Troubleshooting procedure
35
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 in 3 to 5 minutes after power-on of outdoor unit, when the indoor unit No. set by DSW6 and
RSW1 on I.U. PCB in the same refrigerant system No. duplicates.
This alarm code is displayed when the refrigerant system No. and the address setting value are 64 or more. (The alarm
code "b1" is displayed on the wired controller.)
This alarm code is displayed when refrigerant system No. set by DSW4 and RSW1 on service board or outdoor unit PCB
(4~6HP) in the same H-LINK ll system duplicates.
?
N O T E
In the case of H-LINK ll system, this alarm code may be displayed when DSW4 and RSW1 (for refrigerant system No. setting) on the
outdoor unit and DSW5 and RSW2 (for refrigerant system No. setting) on the indoor unit PCB are not set correctly. In this case, turn OFF
the power supply and set them correctly, and turn ON the power supply again. (The rotary switch RSW2 is not available depending on the
indoor unit model.)
36
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 indicated in case that there is at least 1 indoor unit of a model other than GP (supporting R32
refrigerant) among the connected indoor units.
This alarm forces all operations to stop (Outdoor & Indoor Units).
The unit should be stopped to release the alarm.
281 SMGB0136 rev.0 - 07/2021
Incorrect Setting of Indoor Unit Number
Incorrect of Indoor Unit Combination
10