Hisense AUV-18HR4SUA User Manual page 9

3. Not Cooling or Heating Well
Check for obstruction of air flow of outside or inside units.
Check if too much heat source exists in the room.
Check if the air filter is clogged with dust.
Check to see if the doors or windows are opened or not.
Check if the temperature condition is not within the operation range.
4. This is Not Abnormal
Smells from indoor unit
Smell adheres on indoor unit after a long period of time. Clean the air filter and panels or allow a good
ventilation.
Sound from Deforming Parts
During system starting or stopping, an abrading sound might be heard. However, this is due to thermal
deformation of plastic parts. It is not abnormal.
Steam from Outdoor Heat Exchanger
During defrosting operation, ice on the outdoor heat exchanger is melted, resulting in making steam.
Dew on Air Panel
When the cooling operation continues for a long period of time under high humidity conditions(higher than
27℃/80%R.H.), dew can form on the air panel.
Refrigerant Flow Sound
While the system is being started or stopped, sound from the refrigerant flow may be heard.
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Operation manual