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Problem
Possible cause and points to check
Unit won't start.
• Is power plug inserted?
• Is there a power failure?
• Is fuse blown out?
Poor cooling.
• Is the air filter dirty? Normally it should be
cleaned every 15 days.
• Are there any obstacles before inlets and out-
lets?
• Is temperature set correctly?
• Are there some doors or windows left open?
• Is there any direct sunlight through the win-
dow during the cooling operation? (Use cur-
tains).
• Are there too much heat sources or too many
people in the room during cooling operation?
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