Midea MLCAC-UTSM-2010-10

Troubleshooting MLCAC-UTSM-2010-10
86 Outdoor Units
5. E4 malfunction
E4 display
Check whether the wiring of the outdoor ambient temperature sensor (T4) is
broken off
Replace PCB
Judge 1: Outdoor condenser temp. sensor (T3) is malfunction
Check whether the wiring of the condenser temp. sensor is broken off
Connect the wiring well
Yes
No
Check whether the resistance of condenser temp. sensor is wrong
refer to the Annex 1
Yes
Replace condenser temp. sensor
No
Judge 2: Outdoor ambient temp. sensor (T4) is malfunction
Connect the wiring well
Yes
No
Check whether the resistance of outdoor ambient temperature sensor
(T4) is wrong refer to the Annex 1
Yes
Replace outdoor ambient temperature sensor
(T4)
No