Midea ATOM B Series Service Manual page 61

Atom B Series VRF 50/60Hz
2.12 EP: Outdoor ambient temperature is lower than -15
2.12.1 Digital display output
EP
2.12.2 Description
 Outdoor ambient temperature is lower than -15℃ in cooling operation.
 The system stops running.
 Error code is displayed on outdoor unit PCB.
2.12.3 Trigger / recover condition
 Trigger condition: Outdoor ambient temperature is lower than -15℃ in cooling operation.
 Recover condition: Outdoor ambient temperature is over -15℃.
 Reset method: Resume automatically.
2.12.4 Possible causes
 TL temperature sensor damaged.
 TL temperature sensor connect to the main control board is loose.
 Main PCB damaged.
2.12.5 Procedure
T4 sensor detected temperature is lower
T4 temperature sensor has short-
circuited or failed
Replace outdoor main control board
60
EP
than -15℃
No
No
℃
in cooling operation (For all models)
Yes
Temperature over operation range
Yes
Replace the T4 sensor