Midea V8 VRF Series Service Manual page 43

V8 VRF Indoor Units
6.1.2 A11 - R32 refrigerant leaks, requiring shutdown immediately
Error display


Error impact
ODU of the same system: It stops running after recycling is completed, displaying code "A15" -
R32 refrigerant leaks.
When the IDU main control board receives a refrigerant leakage signal from R32 refrigerant
Error trigger
detection device (See Figure 1 below)
The fault is automatically cleared if one of the following conditions is met:
Error recovery



Possible cause

Troubleshooting
Note 1:
Step 1: Check whether pipes are leaking refrigerant.
Method: Use a refrigerant pressure gauge to connect the service valve needle on the liquid side or
gas side of the ODU, and measure the refrigerant saturation pressure in the pipeline on site. If the
measured refrigerant saturation pressure on the liquid side or gas side is less than the standard
saturation pressure (see Table of Ambient Temperature and Standard Saturation Pressure of R32
attached to this manual), there is a refrigerant leak. Follow the steps below to repair refrigerant
leaks:

42
Digital display
Faulty IDU: The fan operates at the highest speed, the EXV is closed (Note: Fault persists
after power on again), and buzzer of the display control board of the faulty IDU and buzzer of
wired controller connected to the faulty IDU keep beeping.
Other IDUs of the same system: Refrigerant is recycled to ODU. After recycling is completed,
other IDUs stop running, displaying code "A51" - ODU fault (V6 platform IDU displays the
code "Ed")
Has not detected the refrigerant leak signal for 120 minutes (If the IDU is powered off, time
must be measured again)
Has not detected the refrigerant leak signal and has received the signal of refrigerant fault
rectification
R32 refrigerant of IDUs leaks.
The IDU main control board is damaged.
A15
Are
there any R32 refrigerant
leaks in the pipes?
No
Replace
the main control board of
the IDU.Is the fault
cleared?
No
Contact the technical
support personnel of your
dealer
Use a refrigerant recovery machine to recover refrigerant left in the unit.
Display position
Panel, display box, and wired controller
Yes
Follow the instructions of
Note (1)
Yes
Fault cleared