Error Codes: Overview - Daikin RXYSQ5T8VB Installation And Operation Manual

8 Troubleshooting
8.1.1

Error codes: Overview

Main code
▪ The stop valve of an outdoor unit is left closed.
▪ Refrigerant overcharge
▪ The stop valve of an outdoor unit is left closed.
▪ Insufficient refrigerant
Electronic expansion valve malfunction
(Y1E) - A1P (X21A)
(Y3E) - A1P (X22A)
▪ The stop valve of an outdoor unit is left closed.
▪ Insufficient refrigerant
Refrigerant overcharge
Ambient temperature sensor malfunction (R1T) - A1P
(X11A)
Discharge temperature sensor malfunction (R2T): open
circuit / short circuit - A1P (X12A)
Suction temperature sensor malfunction
(R3T) - A1P (X12A)
(R5T) - A1P (X12A)
Liquid temperature sensor (coil) malfunction (R4T) - A1P
(X12A)
Liquid temperature sensor (after subcool HE) malfunction
(R7T) - A1P (X13A)
Gas temperature sensor (after subcool HE) malfunction
(R6T) - A1P (X13A)
High pressure sensor malfunction (S1NPH): open circuit /
short circuit - A1P (X17A)
Low pressure sensor malfunction (S1NPL): open circuit /
short circuit - A1P (X18A)
Transmission outdoor unit - inverter: INV1 / FAN1
transmission trouble
INV1 unbalanced power supply voltage
Reversed power supply phase malfunction
Insufficient supply voltage
Malfunction code: System test run not yet executed (system
operation not possible)
No power is supplied to the outdoor unit.
Faulty wiring to Q1/Q2
System mismatch. Wrong type of indoor units combined
(R410A, R407C, RA, etc)
Indoor unit malfunction
Improper type of indoor units are connected.
Incorrect interconnections between units.
Installation and operation manual
24
Cause Solution
▪ Open the stop valve on both the gas and liquid side.
▪ Recalculate the required amount of refrigerant from the
piping length and correct the refrigerant charge level by
recovering any excessive refrigerant with a refrigerant
recovery machine.
▪ Open the stop valve on both the gas and liquid side.
▪ Check if the additional refrigerant charge has been
finished correctly. Recalculate the required amount of
refrigerant from the piping length and add an adequate
amount of refrigerant.
Check connection on PCB or actuator.
▪ Open the stop valve on both the gas and liquid side.
▪ Check if the additional refrigerant charge has been
finished correctly. Recalculate the required amount of
refrigerant from the piping length and add an adequate
amount of refrigerant.
Recalculate the required amount of refrigerant from the
piping length and correct the refrigerant charge level by
recovering any excessive refrigerant with a refrigerant
recovery machine.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection.
Check if power supply is within range.
Correct phase order.
Check if the supply voltage is supplied properly.
Execute system test run.
Check if the power wiring for the outdoor unit is connected
correctly.
Check Q1/Q2 wiring.
Check if other indoor units have malfunction and confirm
indoor unit mix is allowed.
Check the type of indoor units that are currently connected.
If they are not proper, replace them with proper ones.
Connect interconnections F1 and F2 of the connected BP
unit correctly to the outdoor unit's PCB (TO BP UNIT). Make
sure that the communication with the BP unit is enabled.
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482275-1 – 2017.04