Midea M-Thermal Series Service Manual page 61

M‐Thermal Split
4.14 P0, HP Troubleshooting
Digital display output
Description
 P0 indicates suction pipe low pressure protection. When the suction pressure falls below 0.14MPa, the system
displays P0 protection and M‐Thermal Split stops running. When the pressure rises above 0.3MPa, P0 is removed and
normal operation resumes.
 HP indicates P0 protection has occurred 3 times in 60 minutes. When an HP error occurs, a manual system restart is
required before the system can resume operation.
 Error code is displayed on outdoor unit main PCB and user interface.
Possible causes
 Low pressure switch not connected properly or has malfunctioned.
 Insufficient refrigerant.
 Low pressure side blockage.
 Poor evaporator heat exchange in heating mode or DHW mode.
 Insufficient water flow in cooling mode.
 Outdoor unit main PCB damaged.
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201909