Signal Transmission Error On Outdoor Unit Pcb (50 Class Only) - Daikin J Series Service Manual

SiBE041101
4.26 Signal Transmission Error on Outdoor Unit PCB
(50 Class Only)
U7
Remote
Controller
Display
Method of Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
The abnormality is determined when the data sent from the PM1 can not be received for 9
seconds.
The error counter is reset when the data from the PM1 can be successfully received.
Defective outdoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power and turn it on
again.
Error again?
NO
YES
Troubleshooting
Replace the outdoor unit
PCB.
The cause can be an
external factor other than
the malfunction.
Observe the operating
condition in long term.
(R7185)
122