A1: Refrigerant Leakage Protection (For Ms01) - Midea VRF Series Service Manual

3.11 A1: Refrigerant leakage protection (for MS01)

Digital display output
Description
 Refrigerant leakage protection.
 All units stop running.
 Error code is displayed on the malfunction MS box.
Trigger / recover condition
 Trigger condition: Communication between main control board and inverter driver board is abnormal for 2 minutes.
 Recover condition: Communication go back to normal.
 Reset method: Resume automatically.
Possible causes
 S1 dial setting error.
 Refrigerant leak.
 Refrigerant leak sensor failure.
 MS PCB damaged.
Procedure
S1 dial setting error.
Refrigerant leak sensor failure.
Replace the MS main PCB
A1
No
Refrigerant leak.
No
No
Yes
Set S1 dial code correctly.
Yes
Find leaks and fix the problem.
Yes
Replace the refrigerant leak sensor.
V6R VRF 50/60Hz
161