Midea MV6-R252WV2RN1 - 2.33 U31, U32, U33: Stop valve is not open.; 2.33.1 Digital display output; 2.33.2 Description; 2.33.3 Trigger; recover condition

V6R VRF 50Hz
148
Midea
V6R
Series Service Manual
2.33 U31, U32, U33: Stop valve is not open.
Digital display output
Description
 U31: Liquid side stop valve is not opened.
 U32: High pressure gas side stop valve is not opened.
 U33: Low pressure gas side stop valve is not opened.
 All units stop running.
 Error code is only displayed on the master unit.
Trigger / recover condition
 Trigger condition:
U31: Pc_max ≥ 3.9MPa in heating operation.
U32: Pc_max ≥ 3.9MPa in heating operation.
U33: Pe_min < 0. 12MPa in cooling operation.
 Recover condition:
The stop valves are opened and system pressure recover to normal.
 Reset method: Manually restart.
Possible causes
 Stop valve is not open.
Procedure
U31, U32, U33
Check and open the stop valve.