A1W: Refrigerant Leakage Protection - Midea VRF Series Service Manual

V6R VRF 50/60Hz

2.28 A1w: Refrigerant leakage protection

Digital display output
Description
 Refrigerant leakage protection.
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Trigger condition:
If any MS reports refrigerant leak failure A1, the failure is sent to the ODU.
Menu Settings
nE=1
nE=2
nE=3
 Recover condition:
The outdoor unit does not receive the refrigerant leakage fault signal sent by the MS.
 Reset method: Resume automatically.
Possible causes
 Refrigerant pipe or indoor unit leak.
 The refrigerant leak sensor is not connected or has malfunction.
 MS main control board is damaged.
Procedure
Refrigerant pipe or indoor unit leak.
The refrigerant leak sensor is not
connected or has malfunction.
Replace the MS main PCB
142
Error Code Description
A11 The unit is stopped forcedly after the ODU reports A11.
A12 The unit is stopped forcedly 12 hours after the ODU reports A12.
A13 The unit is stopped forcedly 24 hours after the ODU reports A13.
A11/A12/A13
No
No
Yes
Find leaks and repair welding
Check the setting of dial S1 on the MS
Yes
and whether the refrigerant sensor is
connected properly and is not damaged