Alarm code
C2
Incorrect setting of the indoor unit connection number (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 (LED4, 5, 6) in PCB(1) of the CH unit flashes.
* < Heat recovery system (3 pipes) >
This alarm is indicated when nine or more indoor units are connected to the CH unit.
No
Yes
Are 9 or more indoor units
connected to CH unit?
Correctly connect the wiring
and reset
the power supply.
Failure of PCB(1) in CH unit
PCB1: Control PCB in Outdoor Unit
PCB(1): CH Unit PCB
• Alarm code "C2" will be indicated when the units are connected as follows.
Outdoor Unit
(Ref. Cycle Group: 1)
CH Unit
Indoor Unit 1
(Ref. Cycle Group: 1)
Indoor Unit 2
(Ref. Cycle Group: 1)
Indoor Unit 3
(Ref. Cycle Group: 1)
Indoor Unit 9
(Ref. Cycle Group: 1)1)
8 Troubleshooting
236
SMGB0065 rev. 1 - 12/2010
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