AF stands for 'Air Flow'. The machine is warning you that the exhaust vent airflow is insufficient. Check the exhaust hose in the rear of the machine and make sure it it not crushed or kinked. The vent pipe should be the rigid metal type not flexible foil or flexible plastic. If everything in rear looks OK, check the outside vent hood for any blockages. If everything checks out, the exhaust system may need cleaning. Cleaning kits are available at most home improvement centers.
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I have had my dryer for only 2 years and I have not heard about the vent pipe or exhaust system needing to be cleaned in two years. How often should the vent pipe or exhause system be cleaned?
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