SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 285
4.54 Improper Combination of Indoor and Outdoor Units,
Indoor Units and Remote Controller
Error Code UA
Applicable
Models
All indoor units
All outdoor units
Method of Error
Detection
A difference occurs in data by the type of refrigerant between indoor and outdoor units.
The number of indoor units is out of the allowable range.
Error Decision
Conditions
The error decision is made as soon as either of the abnormalities aforementioned is detected.
Supposed
Causes
Excess of connected indoor units
Defective outdoor main PCB
Mismatching of the refrigerant type of indoor and outdoor unit.
Setting of outdoor main PCB was not conducted after replacing to spare PCB.
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