Midea MIV V4+ Mini Service Manual page 37

DM12-01.01.05en
4) E4 malfunction
Judge 1: Outdoor condenser's middle temp. sensor (T3) is malfunction
Check whether the wiring of the condenser's middle temp. sensor
is break off
Check whether the resistance of condenser's middle temp.
sensor is wrong refer to the Annex 1
Judge 2: Outdoor ambient temp. sensor (T4) is malfunction
Check whether the wiring of the outdoor ambient temperature
sensor (T4) is break off
Check whether the resistance of outdoor ambient temperature
sensor (T4) is wrong refer to the Annex 1
Outdoor units
LED indicates E4
No
No
No
No
Replace PCB
MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
Yes
Connect the wiring well
Yes
Replace condenser's middle temp.
sensor
Yes
Connect the wiring well
Yes
Replace outdoor ambient
temperature sensor (T4)
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