Admiral Dryer Error Code F23: Thermistor Short Circuit... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) in the Admiral dryer monitors the thermistor, which is a temperature-sensitive resistor. The thermistor's resistance changes with temperature. The MCU supplies a low voltage (typically 5V DC) to the thermistor circuit. If the MCU detects a short circuit (low resistance) in the thermistor circuit, it interprets this as a fault and displays the F23 error code.

Symptoms:

The homeowner observes that the dryer displays an F23 error code on the control panel. The dryer may not start, or it may start but not heat properly. The cycle may also stop prematurely.

Possible Causes:

Shorted thermistor
Wiring harness fault
Faulty dryer control board (MCU)
Loose connection at thermistor or control board
Thermistor touching the dryer housing

Solution:

1

Unplug the dryer from the 120V AC outlet.
2

Disconnect the rear access panel using a 1/4-inch nut driver.
3

Locate the thermistor, typically on the blower housing or near the heating element.
4

Disconnect the thermistor connector.
5

Use a multimeter to measure the resistance across the thermistor terminals. A shorted thermistor will read close to 0 ohms. At room temperature (70-75°F), a typical thermistor should read between 10,000 and 50,000 ohms.
6

Inspect the wiring harness for any signs of damage or shorts. Repair or replace as needed.
7

If the thermistor and wiring are good, suspect a faulty dryer control board (MCU). Replace the MCU.

Safety Warning:

Disconnect power to the dryer before performing any repairs. Use proper lockout/tagout (LOTO) procedures. High voltage is present when the dryer is plugged in. Be careful when working near the heating element.

Prevention:

Regularly clean the lint filter after each load to prevent overheating, which can damage the thermistor. Inspect the venting system at least once a year to ensure proper airflow.

Expert Tip:

Some Admiral dryers have a service mode. Try pressing and holding the Start and End of Cycle buttons simultaneously for 3 seconds. This may display additional diagnostic information or allow you to clear the error code after the repair.

Frequently Asked Questions

•What is the typical resistance range of a thermistor at room temperature?

At room temperature (70-75°F), a typical thermistor should read between 10,000 and 50,000 ohms. Consult the dryer's service manual for the exact specifications.

•How do I access the dryer's service mode?

The service mode access varies between models. A common method is pressing and holding the Start and End of Cycle buttons simultaneously for 3 seconds. Refer to the dryer's service manual.

•What type of thermistor does my Admiral dryer use?

Most Admiral dryers use an NTC (Negative Temperature Coefficient) thermistor, meaning its resistance decreases as the temperature increases. Check the dryer's parts diagram or service manual for the exact specifications.

Admiral Dryer Error Code F23: Thermistor Short Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range of a thermistor at room temperature?

•How do I access the dryer's service mode?

•What type of thermistor does my Admiral dryer use?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: