Midea MCA3U-09HRFN1-M(C)

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17.4.5 Open or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3)
Error Code
E4/E5/F1/F2/F3
Malfunction conditions
If the sampling voltage is lower than 0.06V or higher than 4.94V,
the LED displays a failure.
Potential causes
● Wiring mistake
● Faulty sensor
● Faulty PCB
Trouble shooting:
Check the connection
between temperature
sensor and PCB. Is it
properly wired?
Ensure proper connectionNo
Yes
Replace indoor or outdoor
main PCB
Measure the resistance
value of the sensor. Is it
within acceptable
parameters?
Replace the sensorNo
Yes