Daikin VRV 5-S Series - Page 149

26 | Troubleshooting
Installer and user reference guide
149
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
Main
code
Cause Solution SVEO
(a)
SVS
(b)
▪ The stop valve of an outdoor unit is
left closed.
▪ Insufficient refrigerant
▪ 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.
Electronic expansion valve malfunction
(Y1E) - A1P (X21A) / (Y3E) - A1P (X23A)
Check connection on PCB or actuator.
▪ The stop valve of an outdoor unit is
left closed.
▪ Insufficient refrigerant
▪ 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.
Refrigerant overcharge 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.
Ambient temperature sensor
malfunction (R1T) - A1P (X18A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R21T): open circuit /
short circuit - A1P (X19A)
Check connection on PCB or actuator.
Suction temperature sensor
malfunction (R3T) - A1P (X30A)
(suction) / (R5T) - A1P (X30A) (subcool)
Check connection on PCB or actuator.
Liquid temperature sensor (coil)
malfunction (R4T) - A1P (X30A)
Check connection on PCB or actuator.
Liquid temperature sensor (after
subcool HE) malfunction (R7T) - A1P
(X30A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool
HE) malfunction (R6T) - A1P (X30A)
(superheat)
Check connection on PCB or actuator.
High pressure sensor malfunction
(S1NPH): open circuit / short circuit -
A1P (X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): open circuit / short circuit -
A1P (X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter:
INV1 / FAN1 transmission trouble
Check connection.
INV1 unbalanced power supply voltage Check if power supply is within range.