Midea MP12HMB63 - Troubleshooting; Error Display Codes; General Troubleshooting Guide

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Check the connection
between temperature
sensor and PCB. It is
properly connected?
Measure the resistance
value of the sensor.
10. Troubleshooting
10.1 Error Display
Codes
Explanations
AS
Open or short circuit of T1 temperature sensor
ES
Open or short circuit of T2 temperature sensor
CS
Open or short circuit of T3 temperature sensor
OS
Open or short circuit of T4 temperature sensor
HS
Open or short circuit of T5 or T6 temperature sensor
Lo
Temperature is lower than display range (32°F)
HI
Temperature is higher than display range (99°F)
E4
Communication malfunction between main control board and display board
LE
Drive-by-wire control failure
10.2 Troubleshooting
10.2.1 Open circuit or short circuit of temperature sensor diagnosis and solution (AS/E5/CS/oS/HS).
Error Code:
AS/ES/CS/OS/HS
Malfunctioning conditions:
If the sampling voltage is lower than 0.06V or higher than
4.94V, the LED will display the failure.
Possible causes:
●
Wiring mistake
● Faulty sensor
● Faulty PCB
Troubleshooting:
No
Yes
No
Yes
Replace indoor main PCB.
Correct the connection.
Replace the sensor.