M thermal Split
202004 99
4.22 Pd Troubleshooting
Digital display output 4.22.1
Description 4.22.2
High temperature protection of air side heat exchanger refrigerant outlet in cooling mode. When the air side heat
exchanger refrigerant outlet temperature is higher than 61°C for more than 3 seconds, the system displays Pd
protection and M-Thermal Split stops running. When the air side heat exchanger refrigerant outlet temperature
returns drops below 55°C, Pd is removed and normal operation resumes.
M-Thermal Split stops running.
Error code is displayed on outdoor unit main PCB and user interface.
Possible causes 4.22.3
Temperature sensor not connected properly or has malfunctioned.
Poor condenser heat exchange.
Fan motor damaged.
Hydronic box main PCB damaged.
Midea CAC
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