U31, U32, U33: Stop Valve Is Not Open - Midea VRF Series Service Manual

V6R VRF 50/60Hz

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
148
U31, U32, U33
Check and open the stop valve.