Troubleshooting by Error Code
SiME332106E
256
Part 6 Service Diagnosis
5.60 Transmission Error between Outdoor Units
Applicable
Models
All outdoor unit models
Error Code
U7
Method of Error
Detection
Microcomputer checks if transmission between outdoor units is normal.
Error Decision
Conditions
Transmission is not carried out normally for a certain amount of time
Supposed
Causes
Connection error of transmission wirings between outdoor unit and external control adaptor
for outdoor unit
Cool/Heat selection setting error
Cool/Heat unified address setting error (functional unit, external control adaptor for outdoor
unit)
Defective outdoor unit main PCB
Defective external control adaptor for outdoor unit
Troubleshooting
Go to Diagnosis Flowchart-1.
(Transmission error when the
external control adaptor is
mounted)
Ensure the sub code or
the lamp display of
monitor mode, and then
go to the following:
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Go to Diagnosis Flowchart-2.
(Transmission error when the
external control adaptor is
mounted)
Error code
Sub code
Error code
Sub code
Error code
Sub code
Go to Diagnosis Flowchart-11.
(Connection of excess indoor
units for test operation)
U7-01
U7-02
U7-11
