Alarm code
C1
Incorrect indoor unit connection (CH unit).
• The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
• The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* < Heat recovery system (3 pipes) >
This alarm is indicated when two or more CH units are connected between the outdoor unit and the indoor unit.
No
Yes
Is wiring connection for CH unit
incorrect?
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 "C1" will be indicated when the units are connected as follows.
Alarm Code "C1" will be indicated in this CH unit.
CH Unit
Indoor Unit Indoor Unit Indoor Unit
CH Unit CH Unit
Indoor Unit
Outdoor UnitUnit
8 Troubleshooting
235
SMGB0065 rev. 1 - 12/2010
8
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