10 Troubleshooting
Installer and user reference guide
41
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388989-1B – 2016.02
Pay attention to the fan. It is dangerous to inspect the unit while the
fan is running. Make sure to turn off the main switch and to remove
the fuses from the control circuit located in the outdoor unit.
9.3
About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2‑21]. Refer to
"7.2 Making field settings" on
page 31
for details how to set mode 2.
When vacuuming/recovery mode is used, check very carefully what
should be vacuumed/recovered before starting. See installation
manual of the indoor unit for more information about vacuuming and
recovery.
9.3.1
To use vacuum mode
1
When the unit is at standstill, set the unit in [2‑21]=1.
Result:
When confirmed, the indoor and outdoor unit expansion
valves will fully open. At that moment the 7‑segment display
indication=
and the user interface of all indoor units
indicate TEST (test operation) and
(external control) and
the operation will be prohibited.
2
Evacuate the system with a vacuum pump.
3
Press BS3 to stop vacuuming mode.
9.3.2
To recover refrigerant
This should be done by a refrigerant reclaimer. Follow the same
procedure as for vacuuming method.
NOTICE
Make sure to NOT recover any oil while recovering
refrigerant.
Example:
By using an oil separator.
10
Troubleshooting
10.1
Overview: Troubleshooting
This chapter describes what you have to do in case of problems.
It contains information about:
▪ Solving problems based on error codes
10.2
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.
The malfunction code which is displayed 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
malfunction code will be displayed intermittent.
Example:
Code
Example
Main code
Sub code
With an interval of 1 second, the display will switch between main
code and sub code.
10.3
Error codes: Overview
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
Earth leakage detector activated
Restart the unit. If problem reoccurs,
contact your dealer.
High pressure switch was activated
(S1PH, S2PH) - A1P (X3A; 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.
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