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

Technical Background:

The AF error code on a Hotpoint dryer indicates that the main control unit (MCU) has detected insufficient airflow through the dryer. This is typically monitored by a thermistor or thermostat that sends a signal to the MCU. If the temperature doesn't rise appropriately within a set time, the AF error is triggered. The MCU uses voltage readings from sensors to determine airflow; a low airflow condition results in a specific voltage range that triggers the fault.

Symptoms:

The homeowner observes the dryer displaying the AF error code. The dryer may run but produce little to no heat, or the drying cycle takes significantly longer than usual. Clothes may be damp even after a full cycle.

Possible Causes:

Blocked exhaust vent
Clogged lint screen
Restricted blower wheel
Kinked or crushed exhaust duct
Lint build-up inside the dryer cabinet

Solution:

1

Unplug the dryer from the 120V AC power outlet or turn off the breaker in the breaker panel.
2

Inspect the outside exhaust vent for obstructions such as bird nests or excessive lint.
3

Disconnect the exhaust duct from the back of the dryer and clean any visible lint.
4

Remove the lint screen and clean it thoroughly with a brush. Wash with soap and water if needed.
5

Access the blower wheel (usually requires removing the lower front panel) and check for lint buildup. Clean as needed. A 1/4-inch nut driver may be required.
6

Inspect the exhaust duct for kinks, crushing, or excessive length. Replace or repair as necessary.
7

After cleaning, reconnect everything and test the dryer.

Safety Warning:

Always disconnect power (LOTO - Lock Out Tag Out) before servicing. Dryers operate on 120V AC or 240V AC (for electric models). High voltage can cause serious injury or death.

Prevention:

Clean the lint screen after every load. Inspect and clean the exhaust duct at least once a year. Ensure the exhaust duct is made of rigid metal or flexible metal ducting, not plastic or foil.

Expert Tip:

Many Hotpoint dryers have a service mode. Entering the service mode allows you to run diagnostic tests, including a blower motor test, which can further pinpoint airflow problems. To enter service mode, consult the technical service manual for your specific model.

Frequently Asked Questions

•What is the maximum allowable length for my dryer exhaust duct?

The maximum allowable length for a dryer exhaust duct is typically 25 feet, with deductions for each elbow (usually 5 feet per 90-degree elbow).

•How do I access the blower wheel assembly on my Hotpoint dryer?

Accessing the blower wheel usually involves removing the lower front panel. You may need to disconnect the door switch wires. Refer to your dryer's service manual for specific instructions.

•If I've cleaned the vent and the AF code persists, what could be the problem?

If the AF code persists after cleaning the vent, the issue could be a faulty thermistor, a malfunctioning blower motor, or a problem with the control board itself. Further diagnostics with a multimeter are needed.

Hotpoint Dryer Error Code AF: Airflow Restriction Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the maximum allowable length for my dryer exhaust duct?

•How do I access the blower wheel assembly on my Hotpoint dryer?

•If I've cleaned the vent and the AF code persists, what could be the problem?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: