Midea M-thermal Split MHA-V4W/D2N8 Installation And Owner's Manual page 30

ERROR MALFUNCTION
CODE OR PROTECTION
The DC fan failure
Main circuit voltage failure
Pressure sensor failure
The main control board PCB
B EEprom failure
H6 displayed 10 times in 2
hours
Low pressure protection
（Pe<0.6） occured 3 times
in an hour
Low pressure protection
FAILURE CAUSE
AND CORRECTIVE ACTION
1. Strong wind or typhoon below toward to the fan, to make the
fan running in the opposite direction. Change the unit direction
or make shelter to avoid typhoon below to the fan.
2.fan motor is broken, change a new fan motor.
1. Whether the power supply input is in the available range.
2. Power off and power on for several times rapidly in short time.
Remain the unit power off for more than 3 minutes than power
on.
3. the circuit defect part of Main control board is defective.
Replace a new Main PCB.
1. Pressure sensor connector is loosen, reconnect it.
2. Pressure sensor failure. change a new sensor.
1. The EEprom parameter is error, rewrite the EEprom data.
2. EEprom chip part is broken, change a new EEprom chip
part.
3. Main PCB is broken, change a new PCB.
Refer to H6
Refer to P0
1. System is lack of refrigerant volume. Charge the refrigerant
in right volume.
2.When at heating mode or DHW mode, the outdoor heating
exchanger is dirty or something is block on the surface. Clean
the outdoor heating exchanger or remove the obstruction.
3. The water flow is too low in cooling mode.increase the water
flow.
4. Electrical expansion valve locked or winding connector is
loosen. Tap-tap the valve body and plug in/ plug off the
connector for several times to make sure the valve is working
correctly.
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