Midea M3OF-27HFN1-M - Outdoor Temperature Sensor Diagnosis and Solution

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7.4.2.4 E4 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge
sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution
F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and
solution.
.
Error Code
E4/F1/F2/F3/F4/F5
Malfunction
conditions
If the sampling voltage is lower than 0.06V or higher than
4.94V, the LED will display the failure.
Potential causes
● Wiring mistake
● Faulty sensor
● Faulty PCB
Trouble shooting:
Check the connections
between temperature
sensor and PCB. Are
the connections good?
Correct the connections.No
Yes
Yes Replace indoor or outdoor PCB.
Replace the sensor
Check the resistance value
of the sensor via Appendix 1
and Appendix 2
Is it normal?
No