Admiral Dryer Error Code AF: Airflow Restriction... | appliancefaults.com

Technical Background:

The dryer's main control unit (MCU) monitors airflow via sensors like the thermistor and sometimes a dedicated airflow sensor. When airflow is insufficient, the MCU detects an abnormal temperature rise or pressure drop, triggering the AF error and shutting down the heating element to prevent overheating. Voltage is supplied to the motor and thermistor through wiring harnesses; any break in these circuits or malfunctioning components will trigger the error.

Symptoms:

The homeowner observes the dryer taking an excessively long time to dry clothes, clothes are still damp after a cycle, and the AF error code is displayed on the control panel. There may also be a burning smell.

Possible Causes:

Clogged dryer vent
Blocked lint filter
Restricted exhaust duct
Faulty blower motor
Defective thermistor

Solution:

1

Disconnect the dryer from the 120V AC power outlet and gas supply (if applicable).
2

Clean the lint filter thoroughly. Inspect for tears or damage; replace if necessary.
3

Disconnect the exhaust vent from the dryer. Check for obstructions, kinks, or crushed sections. Measure airflow using an anemometer; should be above 700 CFM.
4

Inspect the blower wheel for lint buildup or damage. Remove any obstructions.
5

Check the thermistor with a multimeter. Resistance should be around 10k ohms at room temperature (70°F). Replace if faulty.
6

Verify the blower motor is receiving 120V AC during operation using a multimeter. If voltage is present but the motor isn't running, replace the blower motor.
7

Reassemble the dryer and test for proper operation.

Safety Warning:

Disconnect power at the breaker panel before servicing. High voltage components are present. Lockout/Tagout (LOTO) procedures should be followed. Gas dryers require additional precautions to prevent gas leaks.

Prevention:

Clean the lint filter after every load. Inspect and clean the dryer vent at least once a year. Use rigid metal ducting for the exhaust to prevent kinks and crushing.

Expert Tip:

On some Admiral models, entering the service mode by pressing and holding the Start/Pause and End of Cycle signal buttons simultaneously for 3 seconds can clear the error code after resolving the underlying issue. This may not resolve the issue permanently, so ensure proper repair has been made.

Frequently Asked Questions

•What is the maximum recommended length for a dryer vent?

The maximum recommended length for a dryer vent is typically 25 feet, with deductions for elbows (5 feet per 90-degree elbow, 2.5 feet per 45-degree elbow).

•How do I test the thermistor?

Disconnect the thermistor from the circuit. Use a multimeter set to ohms. Measure the resistance across the thermistor terminals. Compare the reading to the thermistor's resistance chart based on ambient temperature. A reading significantly outside the expected range indicates a faulty thermistor.

•What type of duct is recommended for dryer venting?

Rigid metal ducting (aluminum or galvanized steel) is the recommended type for dryer venting. It provides better airflow and is less prone to kinking or crushing compared to flexible foil or plastic ducting.

Admiral Dryer Error Code AF: Airflow Restriction Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the maximum recommended length for a dryer vent?

•How do I test the thermistor?

•What type of duct is recommended for dryer venting?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: