Troubleshooting by Indication on the Remote Controller SiUS39-602
182 Troubleshooting
2.48
“
U7
” Indoor Unit:
Malfunction of Transmission between
Outdoor Units
Remote
Controller
Display
U7
Applicable
Models
All models of indoor units
Method of
Malfunction
Detection
Microcomputer checks if transmission between outdoor units.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
Improper connection of transmission wiring between outdoor unit and external control
adaptor for outdoor unit
Improper connection of transmission wiring between outdoor units.
Improper cool/heat selection
Improper cool/heat unified address (outdoor unit, external control adaptor for outdoor unit)
Defect of outdoor unit PC board (A1P)
Defect of external control adaptor for outdoor unit
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