Transmission Error (Between Microcomputers On The Outdoor Main Pcb) - Daikin SkyAir RZR-TA Series Service Manual

Troubleshooting by Error Codes
4.44 Transmission Error (Between Microcomputers on the
Outdoor Main PCB)
LC
Error Code
Applicable All outdoor units
Models
Method of Error Transmission conditions between microcomputers on the outdoor main PCB are tested via
Detection microcomputer.
Error Decision No normal transmission after a certain period of time
Conditions
Supposed
 Connection error between microcomputers on the outdoor main PCB
Causes  Defective outdoor main PCB (Transmission part)
 Defective noise filter
 External factors (Noise, etc.)
 Defective inverter compressor
 Defective fan motor
Troubleshooting
272
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the
outdoor main PCB
damaged?
NO
Inverter
compressor insulation
resistance is less than
100 kΩ.
NO
Fan motor
insulation resistance is less
than 1 MΩ.
NO
Normal monitoring
light (green) of outdoor main PCB
(A1P) blinks.
YES
Normal
monitoring light
(green) of main PCB
blinks.
YES
YES
YES
YES
NO
NO
SiUS281811EA
Replace the outdoor
main PCB.
Replace the inverter
compressor.
Replace the fan motor.
No LC error. Check
the error code again.
Replace the outdoor
main PCB (A1P).
Keep operating.
( )
Possibly because of
sudden power failure, etc.
Part 6 Service Diagnosis