Bosch MDCI20-3 User Manual page 8

8 | TROUBLESHOOTING
Table 7-1
Symptoms
Unit does not start
Air is discharging, but isn't very cold
Unit stops and starts frequently
Low cooling effect
Low heating effect
6 720 862 442 (2016/04)
Causes
• Power failure.
• Power switch is off.
• Fuse may have been activated.
• The batteries in the remote controller may need
changing.
• The batteries in the remote controller may need
changing.
• 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.
• 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.
• Outdoor temperature is lower than 7°C
• Doors and windows not completely closed.
• Leakage of refrigerant or lack of refrigerant.
Solution
• Wait for the electrical power supply to re-
establish.
• Switch on the power.
• Only a competent person is to replace the fuse.
• Replace batteries
• Set the temperature properly.
• Wait.
• 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.
• 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.
• Use heating device.
• Close doors and windows.
• A qualified person should check for refrigerant
leaks and for the correct refrigerant pressure.
MDCI Series – All DC Inverter Outdoor Units (Three phase)