Midea MV6-R450WV2GN1 - P2, H5: Suction Pipe Low Pressure Protection

V6R VRF 50/60Hz
126
Midea
V6R
Series Service Manual
2.20 P2, H5: Suction pipe low pressure protection
Description
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Trigger condition:
For P2 protection: Suction pressure < 0.07MPa.
For H5 protection: P2 protection appears three times in 60 minutes.
 Recover condition:
 Cooling Only/Main Cooling Discharge pressure ≥ 0.23MPa and Restart permission=ON.
 Heating Only/Main Heating Discharge pressure ≥ 0.18MPa and Restart permission=ON.
 Reset method:
For P2 protection: Resume automatically.
For H5 protection: Manually restart.
Possible causes
 Outdoor unit stop valves are closed.
 Insufficient refrigerant.
 Low pressure side blockage.
 Poor evaporator heat exchange.
 Outdoor main PCB damaged.