Signal Transmission Error On Outdoor Unit Pcb - Daikin FTX-N Series Service Manual

SiUS091601EA

7.16 Signal Transmission Error on Outdoor Unit PCB

U7
Error Code
Method of Error
Communication error between microcomputer mounted on the main PCB and PM1.
Detection
Error Decision  The abnormality is determined when the data sent from the PM1 cannot be received for 9
Conditions
 The error counter is reset when the data from the PM1 can be successfully received.
Supposed
 Defective outdoor unit PCB
Causes
Troubleshooting
Part 6 Service Diagnosis
seconds.
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Error again?
YES
NO
Troubleshooting for Outdoor Unit
The cause can be an
external factor other than
the malfunction.
Observe the operating
condition in long term.
Replace the outdoor unit
PCB (main PCB).
(R21808)
180