6 720 862 442 (2016/04)
MDCI Series – All DC Inverter Outdoor Units (Three phase)
8 | TROUBLESHOOTING
Table 7-1
Symptoms
Causes
Solution
Unit does not start
•
Power failure.
•
Power switch is off.
•
Fuse may have been activated.
•
The batteries in the remote controller may need
changing.
•
Wait for the electrical power supply to re-
establish.
•
Switch on the power.
•
Only a competent person is to replace the fuse.
•
Replace batteries
Air is discharging, but isn‘t very cold
•
The batteries in the remote controller may need
changing.
•
Set the temperature properly.
•
Wait.
Unit stops and starts frequently
•
Too much or too little refrigerant inside the
system.
•
Air or other contaminants in system.
•
Compressor malfunction.
•
Voltage is too high or too low.
•
System circuit is blocked.
•
A qualified person should check for refrigerant
leaks and for the correct refrigerant pressure.
•
Vacuum and recharge refrigerant.
•
Maintenance or change compressor.
•
Install manostat.
•
A qualified person should investigate.
Low cooling effect
•
Outdoor unit and indoor unit heat exchangers
are dirty.
•
The air filter is dirty.
•
Inlet/outlet of indoor/outdoor units is blocked.
•
Doors and windows are open
•
Direct sunshine on outdoor unit.
•
Too much heat resource.
•
Outdoor temp. is too high.
•
Leakage of refrigerant or lack of refrigerant.
•
Clean the heat exchanger.
•
Clean the air filter.
•
Clean filters.
•
Close doors and windows.
•
Ensure the unit is not exposed to direct sunlight.
•
Reduce heat source.
•
AC cooling capacity reduces (normal).
•
A qualified person should check for refrigerant
leaks and for the correct refrigerant pressure.
Low heating effect
•
Outdoor temperature is lower than 7°C
•
Doors and windows not completely closed.
•
Leakage of refrigerant or lack of refrigerant.
•
Use heating device.
•
Close doors and windows.
•
A qualified person should check for refrigerant
leaks and for the correct refrigerant pressure.
