Si20-701_B Troubleshooting by Remote Controller
412
3.95
U7
Transmission Error
Between Outdoor Units
Remote Controller Display
U7
Applicable Models
CMSQ
Method of Error Detection
Micro-computer checks if transmission between outdoor
units.
Error 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)
Defective outdoor unit PCB (A1P)
Defective external control adaptor for outdoor unit
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