Midea ATOM B Series Service Manual page 66

2.17 PL: Radiator surface high temperature protection (For all models)
2.17.1 Digital display output
PL
2.17.2 Description
 Radiator surface high temperature protection.
 The system stops running.
 Error code is displayed on outdoor unit PCB.
2.17.3 Trigger / recover condition
 Trigger condition: Radiator surface temperature TF≥90℃.
 Recover condition: Radiator surface temperature TF≤84℃.
 Reset method: Resume automatically.
2.17.4 Possible causes
 Refrigerant leakage/ Poor condenser heat exchange/ System blockage.
 The connection between refrigerant cooling tube and radiator is loose.
 Main PCB damaged.
2.17.5 Procedure
Power off for 3 minutes and then repower on to check
Spot check the 8
TF is over 90℃ in outdoor unit operation period
Spot check the 9
is too high ,and Inspect whether the refrigerant cooling
tube and radiator is contacted well
System or installation problem
PL
whether PL fault is cleared
No
th
TF temperature to confirm whether
Yes
th
TL temperature to confirm whether TL
Yes
Atom B Series VRF 50/60Hz
Yes
No
No
Main control board damaged
65