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Here are some reasons why this may be happening: * The thermostat is turned to a temperature which is lower than the unit can make the air cool down to. It is worth trying this: turn up the temperature by say 10 degrees. If, after a few minutes - say 30 minutes - the fan in the unit switches off and after another say another 15 minutes it comes on again, then it is likely that the unit is working but is not powerful enough to make the air as cold as you wanted.
* The unit has lost all its refrigerant so is not cooling the air but the thermostat keeps calling for it to cool the air.
* The unit's compressor pump has seized-up or failed in some other way, so is not cooling the air but the thermostat keeps calling for it to cool the air.
To be able to investigate either of the last two reasons you would need to call a Heating, Ventilation and Air Conditioning (HVAC) technician to use his test instruments, tools - and experience - to diagnose the problem and advise you what can be done to fix it.
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