Panasonic CZ-RTC2 User Functions Manual page 4

5. Fan Speed Button:
Use this button to adjust the fan speed between Auto, High, Medium and
Low speed. Each time the Fan Speed Button is pressed will cycle it through
the available speeds.
Auto mode: The air conditioner will automatically decide on the fan speed
according to the room temperature conditions.
Auto
Fan Speed Button
High Medium Low
Note: When the Low speed is selected and the air conditioner is in cooling
mode at a low outdoor temperature of less than 50 degrees, the air
conditioner may automatically switch to Medium fan speed.