Unical CMCS 12HI, User Manual

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TROUBLESHOOTING
Problems and possible solutions
The following table shows a series of problems and their possible reasons and solutions.
Compiere le verifiche descritte prima di richiedere l’intervento dell’Assistenza Tecnica.
PROBLEM REASONS SOLUTIONS
• Power failure.
• Power switch is off.
• Fuse of power switch may have
burned.
• Batteries of remote controller exhausted
or other problem of controller.
Unit does not start.
• Wait for the comeback of power.
• Switch on the power.
• Replace the fuse.
• Replace the batteries or check the
controller.
Air flowing normally, but
completely cannot cooling.
• Temperature is not set correctly.
• The 3-minutes' delay protection for
compressor is active.
• Set the temperature properly.
• Wait 3 minutes, then the compressor
will restart and the Unit will restarts
cooling.
Unit starts and stops
frequently.
• Refrigerant is too little or too much.
• Presence of air or insufficient refrigerant
gas in the refrigerating circuit.
• Compressor's malfunction.
• Voltage is too high or too low.
• System circuit is blocked.
• Check leakage, and rightly recharge
refrigerant.
• Vacuumize and rightly recharge
refrigerant.
• Repair or replace compressor.
• Install a manostat.
• Find reasons and solution.
Low cooling effect.
• Heat exchanger on Indoor and
Outdoor Units is dirty.
• Air filter is dirty.
• Air inlets and outlets on Indoor/
Outdoor Units are obstructed.
• Doors and/or windows are open.
• Sunlight directly shines.
• There are too much heat sources.
• Outdoor temperature is too high.
• Leakage or lack of refrigerant.
• Clean the heat exchanger.
• Clean the air filter.
• Eliminate all dirties on the air inlets/
outlets.
• Close doors and/or windows.
• Install curtains in order to shelter the
Unit from sunshine.
• Reduce heat sources.
• AC cooling capacity is reduced (this
is normal).
• Check leakage and rightly recharge
refrigerant.
Low heating effect.
• Outdoor temperature is lower than
7°C.
• Doors and/or windows are not
completely closed.
• Leakage or lack of refrigerant.
• Install further heating devices.
• Close the doors and/or the windows.
• Check leakage and rightly recharge
refrigerant.