Troubleshooting - Midea MIV V4+ Mini Service Manual

MIV V4+ Mini DC Inverter R410A (220V, 8 kW)

11. Troubleshooting

11.1 Troubles and causes of air conditioner
If one of the following malfunctions occur, stop operation, shut off the power, and contact with your
dealer.
■ The operation lamp is flashing rapidly (twice every second) This lamp is still flashing rapidly after turn off the
power and turn on again.
■ Remote controller receives malfunction or the button does not work well.
■ A safety device such as a fuse, a breaker frequently actuates.
■ Obstacles and water enter the unit.
■ Water leaks from indoor unit.
■ Other malfunctions.
If the system does not properly operate except the above mentioned cases or the above mentioned
malfunctions is evident, investigate the system according to the following procedures.
Symptoms
Unit does not start
Air flowing normally but
completely can it cooling
Units start or stop
frequently
Low cooling effect
Low heating effect
22
Causes
 Power failure.
 Power switch is off.
 Fuse of power switch may have burned.
 Batteries of remote controller exhausted
or other problem of controller.
 Temperature is not set correctly.
 Be in 3 minutes protection of compressor
 Refrigerant is too little or too much.
 Air or no concreting gas in the refrigerating
circuit.
 Compressor is malfunction.
 Voltage is too high or too low.
 System circuit is blocked.
 Outdoor unit and indoor unit heat exchanger
is dirty.
 The air filter is dirty.
 Inlet/outlet of indoor/outdoor
blocked.
 Doors and windows are open.
 Sunlight directly shine.
 Too much heat resource.
 Outdoor temp. is too high.
 Leakage of refrigerant or lack of refrigerant.
 Outdoor temperature is lower than 7 C
 Doors and windows not completely closed.
 Leakage of refrigerant or lack of refrigerant.
 Wait for the comeback of power..
 Switch on the power.
 Relocation.
 Replace the batteries or check the
controller.
 Set the temperature properly.
 Wait.
 Check leakage, and rightly recharge
refrigerant.
 Vacuum and recharge refrigerant.
 Maintenance or change compressor.
 Install manostat.
 Find reasons and solution.
 Clean the heat exchanger.
 Clean the air filter.
 Eliminate all dirties and make air smooth.
units is  Close doors and windows.
 Make curtains in order to shelter from
sunshine.
 Reduce heat source.
 AC cooling capacity reduces normal).
 Check leakage and rightly recharge
 Refrigerant.
 Use heating device.
 Close doors and windows.
 Check leakage and rightly recharge
refrigerant.
DM12-01.01.05en
Solution
Outdoor units