Midea ATOM B Series Service Manual page 73

Atom B Series VRF 50/60Hz
2.18 P4: Discharge temperature protection (For all models)
2.18.1 Digital display output
P4
2.18.2 Description
 Discharge temperature protection.
 The system stops running.
 Error code is displayed on the unit with the error.
2.18.3 Trigger / recover condition
 Trigger condition: Discharge temperature (T5) > 115
 Recover condition: Discharge temperature (T5) < 90
 Reset method: Resume automatically.
2.18.4 Possible causes
 Temperature sensor/switch not
connected properly or has malfunctioned.
 Insufficient refrigerant.
 System blockage.
72
o
C.
o
C.
 Indoor load too large.
 System contains air or nitrogen.
 Poor condenser heat exchange.
 Main PCB damaged.