U5-00 - Communication Abnormality Between Indoor Unit Main Pcb And Remote Controller - Daikin Sky Air FAA71BUV1B Service Manual

3 | Troubleshooting
3.3.20 U5-00 – Communication abnormality between indoor unit main PCB and remote controller
Service manual
36
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Transmission abnormality
between indoor unit main
PCB and remote
controller.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check if multiple remote controllers are wired to the same indoor unit. One
remote controller needs to be set to main while all other remote controllers
need to be set to sub. Also check that the remote controllers are correctly
wired. See installer reference guide of the remote controller for detailed
information.
Possible cause: No main remote controller set when multiple units are wired
to the same indoor unit.
2 Perform a check of the remote controller. See
4
interface" [ 66].
Possible cause: Faulty remote controller or faulty transmission wiring
between remote controller and indoor unit.
3 If possible, switch the faulty remote controller with a remote controller from
another indoor unit.
▪ If error transfers to the other indoor unit, replace the remote controller. See
"4.7 Remote controller user
Possible cause: Faulty remote controller.
▪ If error is still present on the indoor unit, Perform a check of the indoor unit
main PCB. See "4.5 Indoor unit main
Possible cause: Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Effect
Unit will stop operating.
4
interface" [ 66].
4
PCB" [ 53].
Reset
Auto reset.
"4.7 Remote controller user
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02