8 Troubleshooting
Installation and operation manual
22
RXYSQ6TMYFK
VRV IV-S system air conditioner
4P524881-1 – 2018.02
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.
The error code on the outdoor unit will indicate a main malfunction
code and a sub code. The sub code indicates more detailed
information about the malfunction code. The main code and sub
code will be displayed intermittent (with an interval of 1 second).
Example:
▪ Main code:
▪ Sub code:
8.1.1
Error codes: Overview
Main code
Sub code
Cause
Solution
Earth leakage detector activated
Restart the unit. If problem reoccurs, contact your
dealer.
High pressure switch was activated (S1PH) - A1P
(X4A)
Check stop valve situation or abnormalities in
(field) piping or airflow over air cooled coil.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves
Stop valve closed (liquid)
Open liquid stop valve.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves.
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
▪ Open stop valves.
▪ Check refrigerant recharge unit.
▪ Check
the
user
interface's
display
or
transmission wiring between the outdoor unit
and the indoor unit.
Electronic expansion valve malfunction (subcool)
(Y2E) - A1P (X21A)
Check connection on PCB or actuator.
Electronic expansion valve malfunction (main)
(Y1E) - A1P (X23A)
Check connection on PCB or actuator.
Discharge temperature too high (R21T):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant recharge unit.
Compressor casing temperature too high (R8T):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant recharge unit.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves.
Ambient temperature sensor malfunction (R1T) -
A1P (X18A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction (R21T):
open circuit - A1P (X29A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction (R21T):
short circuit - A1P (X29A)
Check connection on PCB or actuator.
Compressor casing temperature sensor
malfunction (R8T): open circuit - A1P (X29A)
Check connection on PCB or actuator.
Compressor casing temperature sensor
malfunction (R8T): short circuit - A1P (X29A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction (R3T) -
A1P (X30A)
Check connection on PCB or actuator.
De-icing temperature sensor malfunction (R7T) -
A1P (X30A)
Check connection on PCB or actuator
Liquid temperature sensor (after subcool HE)
malfunction (R5T) - 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 (R6T) - A1P (X30A)
Check connection on PCB or actuator.
