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11 Troubleshooting
Installer and user reference guide
38
RXYSQ4~6TAY1B
VRV IV-S system air conditioner
4P482257-1 – 2017.03
11 Troubleshooting
11.1 Overview: Troubleshooting
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective wiring.
11.2 Precautions when troubleshooting
WARNING
▪ When carrying out an inspection on the switch box of
the unit, always make sure that the unit is disconnected
from the mains. Turn off the respective circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER bridge safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazard due to the inadvertent resetting of the
thermal cut-out: this appliance must NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
DANGER: RISK OF BURNING
11.3 Solving problems based on error
codes
In case of a displayed malfunction code, perform correcting actions
as explained in the malfunction code table.
After correcting the abnormality, press BS3 to reset the malfunction
code and retry operation.
INFORMATION
If a malfunction occurs, the error code is displayed on the
user interface of the indoor unit.
11.3.1 Error codes: Overview
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)
(Y2E) - 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 (R3T): open
circuit / short circuit - A1P (X29A) Check connection on PCB or actuator.
Suction temperature sensor malfunction
(R2T) - A1P (X30A)
(R7T) - A1P (X30A)
Check connection on PCB or actuator.
Liquid temperature sensor (after subcool HE) malfunction
(R6T) - A1P (X30A) Check connection on PCB or actuator.
Liquid temperature sensor (coil) malfunction (R4T) - A1P
(X30A) Check connection on PCB or actuator.
Gas temperature sensor (after subcool HE) malfunction
(R5T) - A1P (X30A) Check connection on PCB or actuator.