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TROUBLESHOOTING
For diagnosis and repair, Refer to P306 and after, [Wiring Diagram of the Outdoor Unit]
U5 (1) error
Remote controller
line failure
Power of some of the indoor units is OFF, when one
remote controller controls multiple indoor units.
Refer to P198, 1)Check Power
Supply System
Check fuse and transformer
Noise in remote controller wiring
Block noise path and shield the
remote controller wiring
Remote controller signal wire contact failure or disconnec-
tion
Check for remote controller
power supply and signal wire
Indoor control PCB
failure
Indoor control PCB failure
Inspect or replace indoor control
PCB
U7 (4) error
Communication
failure between
outdoor units
Outdoor unit signal wire connection failure during opera-
tion. (disconnected or loosened)
Check outdoor signal wire
Check wiring path
Communication failure caused by noise or other effect Shield signal wire
Power supply is OFF during operation. (Power failure,
open phase)
Refer to P198, 1)Check Power
Supply System
Outdoor control PCB failure
Inspect or replace outdoor con-
trol PCB
- (5) error
Transmission failure
between indoor and
outdoor units
Outdoor unit signal wire connection failure during opera-
tion. (disconnected or loosened)
Check outdoor signal wire
Check wiring path
Communication failure caused by noise or other effect Shield signal wire
Power supply is OFF during operation. (Power failure,
open phase)
Refer to P198, 1)Check Power
Supply System
Outdoor control PCB failure
Inspect or replace outdoor con-
trol PCB
Problem Possible Cause Specific Example Inspection and Treatment
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