Signal Transmission Error (On Outdoor Unit Pcb) - Daikin Super Multi NX FFQ25B8V1B Service Manual

Troubleshooting for Outdoor Unit

7.18 Signal Transmission Error (on Outdoor Unit PCB)

U7
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of Communication error between microcomputer mounted on the main PCB and PM1.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
360
j h i i
1 2 3 4
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
i h
5
YES
SiBE121021_C
Replace the outdoor unit
PCB.
The cause can be an
external factor other than
the malfunction.
Observe the operating
condition in long term.
(R7185)
Service Diagnosis