Midea MOU-12HN1 User Manual page 122

Troubleshooting
E5: Temperature sensor error of water pump
Whether the resistance of the temp. sensor is 10K
E6: Outdoor unit malfunction
Measure whether the voltage of the communication line's red and black end
between the indoor and outdoor unit is +5V
Check the indoor unit main board CN5 or replace the main control board
120
E5
Yes
Replace the PCB
E6
Whether the outdoor unit is power on
Yes
Yes
Yes
Replace the PCB
No
Replace temp. sensor
No
Check when the power is on
No
MCAC-UTSM-2008-11
Replace the outdoor unit
board
Outdoor Units