Midea MGA-D10/N1 Manual page 35

Troubleshooting
E3: Backwater temperature sensor checking channel is abnormal
Judge 1: Check whether the wiring of backwater
temperature sensor is break off
Judge 2: Check whether the backwater temperature
sensor is broken: see whether the resistance of
backwater temperature sensor is wrong refer to the
E4: Outdoor environment temperature sensor checking channel is abnormal
Judge 1: Check whether the wiring of outdoor
environment temperature sensor is break off
Judge 2: Check whether the outdoor environment
temperature sensor is broken: see whether the
resistance of outdoor environment temperature
sensor is wrong refer to the Annex 1
34
LED indicates E3
No
Annex 1
No
Replace the PCB
LED indicates E4
No
No
Replace the PCB
Yes
Connect the wiring well
Yes
Replace the backwater temperature sensor
Yes
Connect the wiring well
Yes
Replace the outdoor environment temperature
MCAC-UTSM-2008-11
sensor
Outdoor Unit