Midea M-Thermal Series Service Manual page 70

4.18 P5 Troubleshooting
Digital display output
Description
 High temperature difference between water side heat exchanger water inlet and water outlet temperatures
protection.
 M‐Thermal Split stops running.
 Error code is displayed on hydronic box main PCB and user interface.
Possible causes
 Temperature sensor not connected properly or has malfunctioned.
 Water piping contains air.
 Insufficient water flow.
 Hydronic box main PCB damaged.
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M‐Thermal Split