Midea ATOM MDV-V56WDHN1(AtB) - Page 79

Atom B Series VRF 50/60Hz
78
Midea
Atom B
Series
Service Manual
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
o
C for 50 seconds
 Recover condition: Pipe temperature < 50
o
C.
 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
PE
Check whether average
temperature T2 of evaporator is
over 63 degrees
Yes
Check whether indoor side
temperature is over the permit
operation range
Yes
No
T2
temperature
sensor fault
No
Test the temperature sensor
resistance to check whether it’s
corresponding to the actual
temperature.
Whether the heat exchanger
needs cleaning.
Yes
No
Indoor unit main control board
damaged
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.