Daikin VRV IV-S RXTQ-TAVJU Series, Service Manual

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Troubleshooting by Error Code SiUS331604E
197 Service Diagnosis
4.42 Transmission Error between Remote Controller and
Indoor Unit
Error Code
U5
Applicable
Models
All indoor units
Method of Error
Detection
In case of controlling with 2-remote controller, check the system using micro-computer is signal
transmission between indoor unit and remote controller (main and sub) is normal.
Error Decision
Conditions
Normal transmission does not continue for specified period.
Supposed
Causes
„
Transmission error between indoor unit and remote controller
„
Connection of two main remote controllers (when using 2 remote controllers)
„
Defective indoor unit PCB
„
Defective remote controller PCB
„
Defective transmission caused by noise
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
All indoor unit
PCB micro-computer
monitors blink.
Operation
returns to normal when
the power is turned OFF
momentarily.
NO
NO
NO
YES
NO
Replace the indoor unit
PCB.
Set one remote controller to
"SUB"; turn the power supply
OFF once and then back ON.
There is possibility of error
caused by noise. Check the
surrounding area and turn ON
again.
There is possibility of error
caused by noise. Check the
surrounding area and turn ON
again.
Normal
Normal
NO NO
Using 2-remote
controllers control.
YES
YES
YES
SS1 of both
remote controllers
is set to "MAIN."
Replace the remote controller.
Normal
YES
Replace the indoor unit PCB.
Normal
YES