Signal Transmission Error (On Outdoor Unit Pcb) - Daikin D-Series Service Manual

Troubleshooting
5.28

Signal Transmission Error (on Outdoor Unit PCB)

U7
Remote
Controller
Display
Outdoor Unit LED A 5
Display
Method of Communication error between microcomputer mounted on the main PCB and PM1.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
258
1 1 2 4 3 4 4
When the data sent from the PM1 can not be received successively for 9 sec.
The abnormality is determined if the above fault conditions occurs once
Fault counter is reset when the data from the PM1 can be successfully received.
Defective outdoor unit PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Turn the power off and turn it on
again.
Error again?
NO
4
YES
Si12-619A
Replace the outdoor unit
PCB.
The cause can be an
external factor other than
the malfunction.
Monitor in long term.
(R5152)
Service Diagnosis