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Troubleshooting
Installer and user reference guide
123
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
INFORMATION
If a malfunction occurs, the error code is displayed on the outdoor unit's 7‑segments
display and on the user interface of the indoor unit.
24.3.1 Error codes: Overview
In case other error codes appear, contact your dealer.
Main code
Cause
Solution
▪
The stop valve of an outdoor unit is left
closed.
▪
Refrigerant overcharge
▪
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.
▪
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 (X22A)
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 (X11A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction
(R2T): open circuit / short circuit - A1P (X12A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction
(R3T) - A1P (X12A)
(R5T) - A1P (X12A)
Check connection on PCB or actuator.
Liquid temperature sensor (coil) malfunction
(R4T) - A1P (X12A)
Check connection on PCB or actuator.