Signal Transmission Error (On Outdoor Unit Pcb) - Daikin FTKS20D3VMW Service Manual

Troubleshooting

5.27 Signal Transmission Error (on Outdoor Unit PCB)

U7
Remote Control
Display
Outdoor Unit LED A 5
Display
Method of
Communication error between microcomputer mounted on the main PCB and PM1.
Malfunction
Detection
" When the data sent from the PM1 can not be received successively for 9 sec.
Malfunction
" The abnormality is determined if the above fault conditions occurs once
Decision
" Fault counter is reset when the data from the PM1 can be successfully received.
Conditions
" Defective outdoor unit PCB
Supposed
Causes
Troubleshooting
274
1 1 2 4 3 4
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn the power off and turn it on
again.
Error again?
NO
4 4
YES
SiENBE12-713
Replace the outdoor unit
PCB.
The cause can be an
external factor other than
the malfunction.
Monitor in long term.
(R5152)
Service Diagnosis