Midea ATOM B Series Service Manual page 79

Atom B Series VRF 50/60Hz
2.22 PE: Evaporator high temperature protection (For all models)
2.22.1 Digital display output
PE
2.22.2 Description
 Evaporator high temperature protection
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.22.3 Trigger / recover condition
 Trigger condition:
The middle average temperature of the evaporator is higher than 63
 Recover condition: Pipe temperature < 50
 Reset method: Resume automatically.
2.22.4 Possible causes
 Indoor temperature is too high.
 Temperature sensor not connected properly or has malfunctioned.
 System blockage.
 Poor condenser heat exchange.
 Indoor unit Main PCB damaged
2.22.5 Procedure
T2
temperature
sensor fault
78
o
C.
PE
Check whether average
temperature T2 of evaporator is
over 63 degrees
Test the temperature sensor
No resistance to check whether it's
corresponding to the actual
temperature.
Indoor unit main control board
damaged
o
C for 50 seconds
Yes
Yes
Yes
Check whether indoor side
temperature is over the permit
operation range
No
Whether the heat exchanger
needs cleaning.
No
Whether the refrigerant pipe is
blocked
Yes
Remove the refrigerant pipe and
then use high pressure nitrogen
or refrigerant to blow the pipe.
Vacuums the pipe then add the
refrigerant again.