Midea MP09HMB82

10.2.3 Drive-by-wire controller failure . (LE)
Error Code
LE
Malfunction decision
conditions
1, Electric heating signal or compressor signal is on, but fan signal is
off
2, Electric heating signal and compressor signal are on, but 4-way
valve signal is off
3, Cooling only models have heating signal, or the 4-way valve signal
and compressor signal are on at the same time.
Supposed causes
● Wiring mistake
● 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
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Drive-by-wire controller failure
Check whether the wiring
between controller and dip
switch board is correct
Wire controller doesn’t
match, change the wire
controller
Yes
No
reconnection
Electric heating and
compressor are on, but 4-way
valve is off
Yes
Electric heating or compressor
is on, but fan is off
Cooling only models have
heating signal, or the 4-way
valve and compressor signal
are on at the same time.
No
Check whether the wiring
between controller and dip
switch board is correct
Yes
4-way valve is set wrong
Yes
No
reconnection
No
Wire controller is set wrong
Yes