Si12-411A Troubleshooting
Service Diagnosis 169
5. Troubleshooting
5.1 Indoor Units
- : Not used for troubleshooting
∗ : Varies depending on the cases.
Indication on
the remote
controller
Description of The Fault Details of fault
(Refer to the
indicated
page.)
00
Indoor unit in normal condition (Conduct a diagnosis of the outdoor
unit.)
—
A1
Indoor unit PCB abnormality 171
A5
Freeze-up protection control or high pressure control (heat pump
model only)
172
A6
Fan motor or related
abnormality
AC motor (Wall : 20~35, Duct, Floor / Ceiling)
174
DC motor (Wall : 50~71, Floor) 175
C4
Heat exchanger thermistor or related abnormality 177
C7
Shutter drive motor / shutter limit switch abnormality 178
C9
Room temperature thermistor abnormality 177
U4
Signal transmission error (between indoor and outdoor units) 179
UA
Unspecified voltage (between indoor and outdoor units) 180