Daikin VRV 5-S RXYSA4A7V1B Installation And Operation Manual page 40

20 Troubleshooting
Main code
R32 sensor 6 months before end of lifetime in
one of the indoor units
Waiting for R32 sensor replacement confirmation
from one of the indoor units
▪ 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 (X23A)
▪ The stop valve of an outdoor unit is left closed.
▪ Insufficient refrigerant
Refrigerant overcharge
Ambient temperature sensor malfunction (R1T) -
A1P (X18A)
Discharge temperature sensor malfunction
(R21T): open circuit / short circuit - A1P (X19A)
Suction temperature sensor malfunction (R3T) -
A1P (X30A) (suction) / (R5T) - A1P (X30A)
(subcool)
Liquid temperature sensor (coil) malfunction
(R4T) - A1P (X30A)
Liquid temperature sensor (after subcool HE)
malfunction (R7T) - A1P (X30A)
Gas temperature sensor (after subcool HE)
malfunction (R6T) - A1P (X30A) (superheat)
High pressure sensor malfunction (S1NPH):
open circuit / short circuit - A1P (X32A)
Low pressure sensor malfunction (S1NPL): open
circuit / short circuit - A1P (X31A)
Transmission outdoor unit - inverter: INV1 / FAN1
transmission trouble
INV1 unbalanced power supply voltage
Insufficient supply voltage
Malfunction code: System test run not yet
executed (system operation not possible)
No power is supplied to the outdoor unit.
▪ 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
40
Cause
One of the R32 sensors is close to the end of lifetime and
(c)
will have to be replaced soon.
Waiting for confirmation that the R32 sensor has been
(c)
replaced in one of the indoor units.
Refer to the service manual for more information.
▪ 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.
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 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.
Solution
VRV 5-S system air conditioner
(a) (b)
SVEO SVS
RXYSA4~6A7V/Y1B
4P600329-1E – 2023.02