Hitachi CP-S833E - Manual (Page 28)

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Clean the air filter about every 100 hours or when " CHECK THE AIR FLOW " is displayed.
Cleaning the air filter
Turn the main power switich off and disconnect the power
plug from the power outlet. 1
Remove the air filter from the bottom. 2
Clean the air filter using a vacuum cleaner.
· When air filter is very dirty, wash it using neutral detergent diluted with water, and dry well.
3
Install the air filter. 4
Caution
· If air filter is stutted with dust, etc., protection circuit will turn the power off.
· "
CHECK THE AIR FLOW " is displayed when you block the ventilation holes.