Transmission Error Between Microcomputers On Outdoor Unit Main Pcb - Daikin VRV S RXQ4/5ARV1 Service Manual

SiAF332111E
5.47 Transmission Error between Microcomputers on
Outdoor Unit Main PCB
Applicable RXQ4/5AR, RXMQ6AR
Models
LC
Error Code
Method of Error Check for the transmission conditions between microcomputers on the outdoor unit main PCB
Detection using a microcomputer.
Error Decision
Normal transmission is disabled for a given period of time or more.
Conditions
Supposed  Connection error between microcomputers on the outdoor unit main PCB
 Defective outdoor unit main PCB (transmission block)
Causes
 Defective noise filter
 External factors (e.g. noise)
 Defective compressor
 Defective fan motor
Troubleshooting RXQ4/5AR
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the outdoor
unit main PCB
damaged?
NO
Compressor
insulation resistance is
less than
100 k:.
NO
Fan motor
insulation resistance is
less than 1 M:.
NO
Normal monitoring
light (green) of outdoor unit main
PCB (A1P) blinks.
YES
YES
YES
YES
NO
Troubleshooting by Error Code
Replace the outdoor
unit main PCB (A1P).
Replace the compressor
(M1C).
Replace the fan motor
(M1F).
Replace the outdoor
unit main PCB (A1P).
Keep operating.
Possibly because of
(
sudden power failure, etc.
)
281