10 Troubleshooting; Overview: Troubleshooting; Solving Problems Based On Error Codes; Error Codes: Overview - Daikin VRV IV+ RYYQ12U7Y1B Series Installer And User Manual

10 Troubleshooting

DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump
down the system, and there is a leak in the refrigerant
circuit:
▪ Do NOT use the unit's automatic pump down function,
with which you can collect all refrigerant from the
system into the outdoor unit. Possible consequence:
Self-combustion and explosion of the compressor
because of air going into the operating compressor.
▪ Use a separate recovery system so that the unit's
compressor does NOT have to operate.
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.
10.3

Error codes: Overview

In case other error codes appear, contact your dealer.
Main code
Master
Installer and user reference guide
50
Sub code
Slave 1 Slave 2
Earth leakage detector activated
Earth leakage detector malfunction:
open circuit) - A1P (X101A )
High pressure switch was activated
(S1PH, S2PH) - A1P (X2A , X3A)
▪ Refrigerant overcharge
▪ Stop valve closed
Stop valve closed (liquid)
▪ Refrigerant overcharge
▪ Stop valve closed
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
Electronic expansion valve malfunction
(main) (Y1E) - A1P (X21A)
Electronic expansion valve malfunction
(liquid cooling) (Y3E) - A1P (X23A)
Electronic expansion valve malfunction
(subcool) (Y2E) - A1P (X22A)
Electronic expansion valve malfunction
(storage vessel) (Y4E) - A1P (X25A)
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
Main code
Sub code
With an interval of 1 second, the display will switch between main
code and sub code.
Cause
Restart the unit. If the problem
reoccurs, contact your dealer.
Check connection on PCB or actuator.
Check stop valve situation or
abnormalities in (field) piping or airflow
over air cooled coil.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves
Open liquid stop valve.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves.
▪ Open stop valves.
▪ Check refrigerant amount+recharge
unit.
▪ Check the user interface's display or
transmission wiring between the
outdoor unit and the indoor unit.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator
Check connection on PCB or actuator
Example
Solution
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09