SiUS12-814 Troubleshooting
Service Diagnosis 111
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 114
A5
Freeze-up protection control or high pressure control (heat pump
model only)
115
A6
Fan motor or related abnormality
AC motor (Duct) 117
DC motor (Duct-free) 118
C4
Heat exchanger thermistor or related abnormality 121
C9
Room temperature thermistor abnormality 121
U4
Signal transmission error (between indoor and outdoor units) 122
UA
Unspecified voltage (between indoor and outdoor units) 124
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