Signal Transmission Error On Outdoor Unit Pcb - Daikin FTXS30HVJU Service Manual

SiUS04-924

4.25 Signal Transmission Error on Outdoor Unit PCB

U7
Remote
Controller
Display
Method of Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
Detection
 When the data sent from the PM1 can not be received successively for 9 seconds.
Malfunction
 The abnormality is determined if the above fault conditions occur once.
Decision
 Fault counter is reset when the data from the PM1 can be successfully received.
Conditions
 Defective outdoor unit PCB
Supposed
Causes
Troubleshooting
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts damage may occur.
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.
Monitor long term.
(R7185)
105