Inverter Radiation Fin Temperature Abnormality - Daikin VRV RXYQ72-384XAYCA Service Manual

Troubleshooting by Error Code

3.56 Inverter Radiation Fin Temperature Abnormality

3.56.1 Inverter Radiation Fin Temperature Abnormality (Inverter PCB)
Applicable
All outdoor unit models
Models
P4
Error Code
Sub code: 09-11
Method of Error
Detect the resistance of the following thermistors while the compressor is not running:
Detection  Radiation fin thermistor
 Thermistor located in PCB circuit
 Heat sink thermistor
Error Decision
When the resistance of the thermistor comes to a value equivalent to open or short circuit.
Conditions
Error is not decided while the unit operation is continued.
P4 will be displayed by pressing the inspection button.
Supposed
 Defective radiation fin temperature thermistor
Causes  Defective inverter PCB
 Defective compressor
 Defective fan motor
Troubleshooting
321
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Make measurement of
resistance of the radiation fin
thermistor.
Is the
resistance of the
relevant thermistor
normal?
YES
The
insulation
resistance of the
relevant compressor is less
than 100 k:.
NO
The insulation
resistance of the relevant
fan motor is less than
1 M:.
NO
Turn ON
the power supply.
Does the error
recur?
NO
NO
YES
YES
YES
SiUS342004EB
Replace the inverter PCB
(A4P).
Replace the compressor.
Replace the fan motor
(M1F, M2F).
Replace the inverter PCB.
Continue operation.
Part 6 Service Diagnosis