Daikin RXSQ24TAVJU, Service Manual, Page: 149 / 311

SiUS331708EA Test Operation
Field Settings and Test Operation 136
3.5 Error Codes and Corresponding Measures
Please check the remote controller connected to the indoor unit for verification.
Error code Description Solution
E3 High pressure switch activated (S1PH) Check the stop valve or (field) piping abnormality
or the airflow on the air cooling heat exchanger.
· Too much refrigerant charged
· Stop valve closed · Check the amount of refrigerant and recharge
the unit.
· Open the stop valve.
Stop valve closed (liquid). Open the liquid stop valve.
· Too much refrigerant charged
· Stop valve closed · Check the amount of refrigerant and recharge
the unit.
· Open the stop valve.
E4 Defective low pressure:
· Stop valve closed
· Refrigerant undercharged
· Defective indoor unit · Open the stop valve.
· Check the amount of refrigerant and recharge
the unit.
· Check the user interface display.
· Check the transmission wiring between the
indoor and outdoor units.
E9 Defective electronic expansion valve
(Subcooling) (RXSQ60TAVJU: Y3E) Check the connection of the PCB or the actuator.
Defective electronic expansion valve (Main)
(Y1E) Check the connection of the PCB or the actuator.
F3 Discharge pipe temperature too high:
· Stop valve closed
· Refrigerant undercharged · Open the stop valve.
· Check the amount of refrigerant and recharge
the unit.
H9 Defective outdoor air thermistor (R1T) Check the connection of the PCB or the actuator.
J3 Defective discharge pipe thermistor (R2T):
Tripping Check the connection of the PCB or the actuator.
Defective discharge pipe thermistor (R2T):
Short circuit Check the connection of the PCB or the actuator.
J5 Defective suction pipe thermistor
(R3T and R5T): Tripping Check the connection of the PCB or the actuator.
J6 Defective outdoor heat exchanger deicer
thermistor (R4T) Check the connection of the PCB or the actuator.
J7 Defective heat exchanger liquid pipe thermistor
(R7T) Check the connection of the PCB or the actuator.
J9 Defective subcooling heat exchanger gas pipe
thermistor (R6T: RXSQ60TAVJU only) Check the connection of the PCB or the actuator.
JA Defective high pressure sensor (S1NPH):
Tripping Check the connection of the PCB or the actuator.
Defective high pressure sensor (S1NPH):
Short circuit Check the connection of the PCB or the actuator.
JC Defective low pressure sensor (S1NPL):
Tripping Check the connection of the PCB or the actuator.
Defective low pressure sensor (S1NPL):
Short circuit Check the connection of the PCB or the actuator.
P1 Inverter unbalanced power supply voltage Check if the power supply meets the
specifications.
U2 Inverter insufficient voltage Check if the power supply meets the
specifications.
Inverter power supply phase missing Check if the power supply meets the
specifications.
U3 System test operation not yet executed (Test
operation cannot be executed.) Execute system test operation.
U4 Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring.
Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring.
System test operation ends abnormally. Re-execute the test operation.
U9 System mismatch
Mismatched indoor unit models used (R-410A,
R-407C, RA, Hydrobox, etc.).
Defective indoor unit Check if there are any other defective indoor
units and verify if the indoor unit combination
meets requirements.