Amana Dryer Error Code AF: Airflow Restricted -... | appliancefaults.com

Technical Background:

The Amana dryer's MCU (Main Control Unit) monitors airflow using thermistors and the heating element. If the MCU detects insufficient airflow or excessive temperature rise, it triggers error code AF. The voltage path involves the thermistor sending a voltage signal to the MCU proportional to the exhaust temperature. A blocked vent increases the exhaust temperature, altering the thermistor's resistance and the signal sent to the MCU.

Symptoms:

The homeowner reports the dryer is displaying error code AF. Clothes are taking longer than usual to dry, or the dryer may shut off before the cycle is complete. There may be a burning smell.

Possible Causes:

Blocked dryer vent
Lint screen clogged
Restricted blower wheel
Faulty blower motor
Defective thermistor
Heating element issue causing excessive heat

Solution:

1

Unplug the dryer from the 120V AC outlet.
2

Disconnect the vent from the dryer and inspect for blockages. Clean thoroughly.
3

Remove the lint screen and clean the lint screen housing.
4

Access the blower wheel (typically behind the lower front panel secured with a 1/4-inch nut driver). Check for obstructions. Clean if needed.
5

Inspect the blower motor windings for continuity using a multimeter. Resistance should be within the manufacturer's specifications.
6

Check the thermistor resistance using a multimeter. Compare readings to the tech sheet at room temperature (70-75°F). It's usually around 10k ohms.
7

Examine the heating element for continuity and shorts to the dryer chassis. A shorted element can cause overheating.

Safety Warning:

Disconnect power to the dryer before performing any repairs. Lock Out/Tag Out (LOTO) procedures are critical. Some components operate at 240V AC; use caution when testing live circuits.

Prevention:

Clean the lint screen after every load. Inspect and clean the dryer vent at least once a year, or more frequently if you notice longer drying times.

Expert Tip:

To enter diagnostic mode on some Amana dryers, press and hold the Start/Pause and End of Cycle signal buttons simultaneously for 3 seconds. This allows you to view past error codes and run diagnostic tests. This varies by model.

Frequently Asked Questions

•What is the typical resistance range for the thermistor on this Amana dryer?

The thermistor resistance varies with temperature. At room temperature (70-75°F), it's typically around 10k ohms. Consult the service manual for the exact specifications for your model.

•How do I access the blower wheel on this particular Amana dryer model?

Typically, you'll need to remove the lower front access panel, often secured with screws or clips. The blower housing is usually located behind this panel. You may need a 1/4-inch nut driver to remove screws holding the blower housing in place.

•Where can I find the service manual or tech sheet for this Amana dryer?

You can often find the service manual online by searching for the model number. Additionally, the tech sheet is sometimes located inside the dryer, often taped to the back panel or inside the control panel area.

Amana Dryer Error Code AF: Airflow Restricted - Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the thermistor on this Amana dryer?

•How do I access the blower wheel on this particular Amana dryer model?

•Where can I find the service manual or tech sheet for this Amana dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: