You can do the first aids which might help before a technician check it out.
You can clean the condenser which is on the back of you refrigerator from any dust with a brush and or blower or a vacuum cleaner this must be done once a year for better performance.So if you are lucky and is not something very serious the above tips can help and sometimes can solve your problem
If the above does not help then their many possibilities for your problem like
Problematic thermostat, can not be fixed must be replaced.Freon leak for which, authorised technician with licence can only deal with Freon gas.Compressor relay or starting capacitor, Evaporator fan, temperature probe and electronic control board are some other possible problems but all need special knowledge and skills and licence for dealing with Freon gas..Good luck
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