Midea MP12HMB63 - Drive-by-Wire Controller Failure Diagnosis

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10.2.3 Drive-by-wire controller failure (LE).
Error Code:
LE
Malfunctioning conditions:
1. Electric heating signal or compressor signal is on, but fan
signal is off.
2. Electric heating and compressor signals are on, but 4-way
valve signal is off.
3. Cooling only models have heating signal, or the 4-way
valve and compressor signals are on at the same time.
Possible causes:
●
Wiring error
● Faulty wire controller
●
Wire controller doesn’t match
Troubleshooting:
DIP Switch Terminal
Designation
24V Controller
FC(L)
Front desk control terminal L
FC(N)
Front desk control terminal N
LOW-FAN
Low fan speed
GL
HI-FAN
High fan speed
GH
4-WAY
4-way valve(for heat pump model)
B
HEAT2
Electrical heater 2
W
HEAT1
Electrical heater 1
(W)
COMP
Compressor
Y
24V(N)
24VAC terminal N COM
C
24V(L)
24VAC terminal L
R