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

SiUS371614E
3.47 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
Service Diagnosis
Defective connection between the inverter PCB and the outdoor unit main PCB
Defective outdoor unit main PCB (transmission block)
Defective noise filter
External factors (e.g. noise)
Defective inverter compressor
Defective fan motor
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
Check in Monitor Mode
8-14 ton classes are equipped
with 2 compressors.
Check for the compressor 1 or
2 applicable to the error code
LC while in monitor mode of
the outdoor unit PCB.
Does the
inverter PCB part
No. match that of the spare
parts list?
YES
The
insulation
resistance of the relevant
inverter compressor is
not more than
100 kΩ.
NO
The
insulation
resistance of the relevant
fan motor is not more
than 1 MΩ.
NO
A
NO
NO
YES
YES
Troubleshooting by Error Code
Properly connect the connector.
Replace with a proper PCB.
Replace the compressor.
REYQ72TA: M1C
REYQ96-168TA: M1C, M2C
Replace the fan motor.
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