Midea V8 VRF Series - Page 53

V8 VRF Indoor Units
52
Midea
V8
Series VRF Indoor Units
6.1.11 b11, b13 - Error in 1# electronic expansion valve coil, error in 2# electronic expansion valve coil
Error display
Digital display
Display position
Panel, display box, and wired controller
Error impact
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
Error trigger
The IDU main control board cannot detect the feedback signal from the electronic expansion valve
coil for no less than 4 seconds.
Error recovery
After the unit is powered on again, the main control program detects a feedback signal from the
electronic expansion valve.
Possible cause
 The electronic expansion valve coil plugged into the EXV port in the IDU main control board
is loose.
 The IDU main control board is damaged.
 The electronic expansion valve coil is faulty.
 The electronic expansion valve coil is short circuited or disconnected.
Troubleshooting
b11/b13 (1)
Is the
electronic expansion
valve coil plugged into the
EXV port in the IDU main
control board
loose?
Reconnect the plug tightly
Replace the main control
board of the IDU
No
Yes
Check
the electronic
expansion valve
Is the coil adapter
short circuited or
disconnected
(3)?
Replace the adapter
Yes
No
Check the
electronic expansion valve
Is the coil abnormal
(2)?
Replace the electronic
expansion valve coil
Yes
No