Signal Transmission Error; (Between Indoor Unit And Remote Controller); Signal Transmission Error (Between Indoor Unit And Remote Controller) - Daikin 3MKS50E3V1B Service Manual

SiBE121135
6.8 Signal Transmission Error (between Indoor Unit and
Remote Controller)
U5
Remote
Controller
Display
Method of
Microcomputer checks if transmission between indoor unit and remote controller is normal.
Malfunction
Detection
Malfunction Normal transmission does not continue for specified period.
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Troubleshooting for SA Indoor Unit - FCQG, FFQ, FHQ, FDBQ, FBQ Series
Connection of 2 main remote controllers (when using 2 remote controllers)
Defective indoor unit PCB
Defective remote controller
Transmission error caused by noise
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Using 2 remote
controllers?
NO
All indoor PCB
microcomputer monitors
blink?
YES
Replace the remote controller.
Return to normal?
NO
Replace the indoor unit PCB.
Return to normal?
NO
Is SS1 of
YES
both remote controllers
set to "MAIN"?
NO
Operation
NO
returns to normal when
the power is turned off
momentarily.
YES
YES
YES
YES
Set one remote controller to
"SUB"; turn the power supply off
once and then back on.
NO
Replace the indoor unit PCB.
There is possibility of
malfunction caused by noise.
Check the surrounding area and
turn on again.
Normal
Normal
There is possibility of
malfunction caused by noise.
Check the surrounding area and
turn on again.
(R13008)
293