Troubleshooting; Overview: Troubleshooting; Precautions When Troubleshooting; Solving Problems Based On Error Codes - Daikin RXYSQ6T7Y1B9 Installer's Manual

NOTICE
Make sure to NOT recover any oil while recovering
refrigerant. Example: By using an oil separator.
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.
11.3.1

Error codes: Overview

Main code
▪ 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 (X22A)
▪ The stop valve of an outdoor unit is left closed.
▪ Insufficient refrigerant
Refrigerant overcharge
Ambient temperature sensor malfunction (R1T) - A1P
(X11A)
Discharge temperature sensor malfunction (R2T): open
circuit / short circuit - A1P (X12A)
Suction temperature sensor malfunction
(R3T) - A1P (X12A)
(R5T) - A1P (X12A)
Liquid temperature sensor (coil) malfunction (R4T) - A1P
(X12A)
Liquid temperature sensor (after subcool HE) malfunction
(R7T) - A1P (X13A)
RXYSQ6T7Y1B9
VRV IV-S system air conditioner
4P404677-1A – 2016.03
11.3
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.
Cause
11 Troubleshooting
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
Solving problems based on error
codes
INFORMATION
If a malfunction occurs, the error code is displayed on the
user interface of the indoor unit.
Solution
▪ 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.
Installer and user reference guide
37