Thank you for contacting Fixya.com. AF is an error that will flash if a restricted air flow is sensed by the dryer control. If three consecutive cycles have low airflow the control will flash the AF error. The AF error code can be cleared by pressing the Drying Temp pad for 5 seconds while in stand-by mode. AF will flash in the display for 1 second then "on" will appear in the display. If you press Drying Temp again and "of" will appear in the display indicating the AF error display has been turned off. Try this procedure and see if the "of" error goes away. If the "of" came up in the display by itself then the keypad may be stuck. However After cleaning the dryer's lint screen, ensure that the exterior exhaust hood connected to the dryer is unblocked, ensure that the vent connecting the dryer to the wall is clear and see that the vent is cleaned professionally.
Please get back to us if you have any further query.
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