Midea M-Thermal Series Service Manual page 63

M‐Thermal Split
4.15 P1 Troubleshooting
Digital display output
Description
 Discharge pipe high pressure protection. When the discharge pressure rises above 4.2MPa, the system displays P1
protection and M‐Thermal Split stops running. When the discharge pressure falls below 3.2MPa, P1 is removed and
normal operation resumes.
 Error code is displayed on outdoor unit main PCB and user interface.
Possible causes
 Pressure sensor/switch not connected properly or has malfunctioned.
 Excess refrigerant.
 System contains air or nitrogen.
 High pressure side blockage.
 Poor condenser heat exchange.
 Outdoor unit main PCB damaged.
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