Inverter Radiation Fin Temperature Rise Abnormality - Daikin VRV RXYMQ-A Series Service Manual

Troubleshooting by Error Code

5.41 Inverter Radiation Fin Temperature Rise Abnormality

Applicable All outdoor unit models
Models
L4
Error Code
Method of Error
Detect temperature of power module of the inverter circuit.
Detection
Error Decision
Thermistor located inside the power module of the inverter circuit for compressor and fan motor.
Conditions Cooling tube plate poor heat-exchange.
Supposed  Radiation fin temperature rise of fan circuit
 Cooling tube plate not fixed with screws
Causes
 U0 error
 Defective inverter circuit
 High outdoor air temperature
 Closed stop valve
Troubleshooting  Subcode L4-01
222
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the stop valve open?
YES
Is the radiation fin
temperature greater than the
designed temperature?
NO
Does the
connector X111A of fin
thermistor connect to the
outdoor unit main PCB
correctly?
YES
Connect to the power and then press
the INSPECTION/TEST button on
remote controller.
Does the remote
controller display error
code P4?
NO
When the unit starts
operating, is the error code L4
displayed again?
NO
NO
YES
NO
YES
YES
SiME332106E
Open the stop valve.
Defective radiation from the power
unit
• Blocked air suction port
• Stained radiation fin
• High outdoor air temperature
Connect the connector correctly.
Eliminate P4 error.
Replace the relevant PCB ( 1).
Keep operating.
Part 6 Service Diagnosis