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

Technical Background:

The Main Control Unit (MCU) monitors the thermistor's resistance to determine the dryer's internal temperature. The thermistor acts as a variable resistor, changing its resistance based on temperature. The MCU expects a specific voltage drop across the thermistor. An F23 error code is triggered when the MCU detects a near-zero resistance, indicating a short circuit in the thermistor circuit or associated wiring.

Symptoms:

US homeowners typically report the dryer stopping mid-cycle, displaying the F23 error code on the control panel. Clothes may not dry properly, or the dryer might shut off prematurely.

Possible Causes:

Shorted thermistor.
Wiring harness issue between the thermistor and the control board.
Faulty control board (MCU).
Lint buildup causing overheating and false readings.
Moisture intrusion affecting thermistor readings.

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Locate the thermistor, usually on the blower housing or near the heating element. Use a 1/4-inch nut driver to access it.
3

Disconnect the thermistor wiring harness.
4

Using a multimeter set to ohms, test the thermistor resistance. A shorted thermistor will read close to 0 ohms at room temperature (approx. 70-75°F).
5

Inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Repair or replace as needed.
6

If the wiring is good and the thermistor is shorted, replace the thermistor with a new one.
7

Reconnect power and test the dryer operation.

Safety Warning:

Always disconnect power to the dryer at the breaker panel before performing any repairs. Use Lock-Out/Tag-Out (LOTO) procedures to ensure the dryer cannot be accidentally powered on during service. Be aware of potential shock hazards working with electrical components, especially the 240V AC power supply.

Prevention:

Regularly clean the lint filter after each load. At least once a year, disconnect the dryer vent and clean out any accumulated lint. Inspect the thermistor and wiring for signs of damage or corrosion during annual maintenance.

Expert Tip:

To access the dryer's diagnostic mode, simultaneously press and hold the 'Cycle Signal' and 'Start' buttons for approximately 3 seconds. This may allow you to clear the error code after repair, or run diagnostic tests.

Frequently Asked Questions

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

A functioning thermistor typically exhibits a resistance between 10,000 and 50,000 ohms (10kΩ to 50kΩ) at room temperature (around 70-75°F). The exact value varies depending on the specific thermistor model.

•If the thermistor tests good, what should I check next?

If the thermistor tests within the acceptable resistance range, inspect the wiring harness and connections between the thermistor and the control board for any signs of damage or corrosion. Use a multimeter to check for continuity in the wiring. If the wiring is good, the control board (MCU) may be faulty and require replacement.

•Can a clogged dryer vent cause an F23 error code?

Yes, a severely clogged dryer vent can cause the dryer to overheat. While the F23 code specifically points to a thermistor circuit issue, excessive heat can indirectly affect thermistor readings or damage the thermistor over time. Always ensure proper ventilation.

Amana 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 good thermistor at room temperature?

•If the thermistor tests good, what should I check next?

•Can a clogged dryer vent cause an F23 error code?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: