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8 | TROUBLESHOOTING
Table 7-1
Symptoms
Unit does not start
Air flowing normally but completely
can't cooling
Units start or stop frequently
Low cooling effect
Low heating effect
6 720 844 656 (2015/11)
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 units is
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.
Solution
• Wait for the comeback of power.
• Switch on the power.
• ReplLocation:
• Replace the batterises 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.
• 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.
MDCI Series – All DC Inverter Outdoor Units (Triphase)
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