Midea MV5-X252W/V2GN1 Service Manual page 79

V5 X VRF 50/60Hz
4.13 H8 Troubleshooting
4.13.1 Digital display output
4.13.2 Description
 Discharge pipe low pressure protection. When the discharge pressure falls below 0.3MPa, the system displays H8
protection and all units stop running. When the discharge pressure returns to normal, H8 is removed and normal
operation resumes.
 Error code is only displayed on the unit with the error.
4.13.3 Possible causes
 Outdoor unit stop valves are closed.
 Pressure sensor not connected properly or has malfunctioned.
 Insufficient refrigerant.
 Low pressure side blockage.
 Poor evaporator heat exchange.
 Main PCB damaged.
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