Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb - Daikin REYQ-XA Service Manual

Troubleshooting by Error Code
3.56 Transmission Error between Inverter PCB and Outdoor
Unit Main PCB
LC
Error Code
Applicable All outdoor unit models
Models
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
Causes
Troubleshooting
331
Defective connection between the inverter PCB and the outdoor unit main PCB
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
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
unit main PCB and each
inverter PCB securely
connected?
(∗1)
YES
Does the
inverter PCB part
No. match that of the spare
parts list?
YES
The
insulation
resistance of the relevant
compressor is not more
than 100 kΩ.
NO
The
insulation
resistance of the relevant
fan motor is not more
than 1 MΩ.
NO
A
Go to the next page.
NO
NO
YES
YES
SiUS371901E
Properly connect the connector.
Replace with a proper PCB.
Replace the compressor.
Replace the fan motor (M1F, M2F).
Service Diagnosis