Alarm code
C3
Incorrect indoor unit connection (CH unit).
• The unit no., alarm code ("35") and the unit code are alternately indicated in the temperature setting section of the indoor
unit connected to the CH unit.
• LED (LED5, 6) in PCB(1) of the CH unit flashes.
* < Heat recovery system (3 pipes) >
This alarm is indicated when an indoor unit with a different refrigerant cycle group is connected to the CH unit.
No
Yes
Yes
No
Is wiring connection for CH unit
incorrect?
Is the refrigerant cycle group setting
for indoor unit connected to
CH unit incorrect?
Correctly con
nect the wiring
and rese
t
the power supply.
Set refrigerant cycle group
(RSW2, DSW5) correctly
and rese
t
the power supply.
Failure of PCB(1) in CH unit
PCB1: Control PCB in Outdoor Unit
PCB(1): CH Unit PCB
• Alarm code "C3" will be indicated when the units are connected as follows.
Refrigerant Cycle Group is different.
Alarm Code "C3" will be indicated in this CH unit.
Outdoor Unit
(Ref. Cycle Group: 1)
CH Unit
Indoor Unit
(Ref. Cycle Group: 1)
CH Unit
Indoor Unit
(Ref. Cycle Group: 1)
CH Unit
Indoor Unit
(Ref. Cycle Group: 1)
Indoor Unit
(Ref. Cycle Group: 2)2)
8 Troubleshooting
237
SMGB0065 rev. 1 - 12/2010
8
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