Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb - Daikin VRV RXYQ72-384XAYCA Service Manual

Troubleshooting by Error Code
3.54 Transmission Error between Inverter PCB and Outdoor
Unit Main PCB
Applicable
All outdoor unit models
Models
LC
Error Code
Method of Error
Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB
Detection using a microcomputer.
Error Decision
When normal transmission is disabled for a given period of time or more.
Conditions
Supposed
 Defective connection between the inverter PCB and the outdoor unit main PCB
Causes  Defective outdoor unit main PCB (transmission block)
 Defective noise filter, compressor or fan motor
 External factors (e.g. noise)
 Failure of inverter PCB or fan PCB
Troubleshooting
317
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the
connector
between each outdoor
NO
unit main PCB and each
inverter PCB securely
connected?
( 1)
YES
Does the
inverter PCB part
NO
No. match that of the spare
parts list?
YES
The insulation
resistance of the
YES
relevant compressor is less
than 100 k:.
NO
The
insulation
YES
resistance of the relevant
fan motor is less than
1 M:
NO
A
Go to the next page.
SiUS342004EB
Properly connect the connector.
Replace with a proper PCB.
Replace the compressor.
Replace the fan motor (M1F, M2F).
Part 6 Service Diagnosis