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

Technical Background:

The F23 error code on a Roper dryer signifies a short circuit in the thermistor circuit. The thermistor is a temperature-sensitive resistor that provides feedback to the Main Control Unit (MCU) about the dryer's internal temperature. The MCU uses this data to regulate the heating element. A short circuit creates a low-resistance path, leading to incorrect temperature readings, triggering the F23 error. The MCU interprets the low resistance as an over-temperature condition, shutting down the dryer or preventing it from starting. The thermistor circuit typically operates on a low voltage, such as 5V DC.

Symptoms:

The Roper dryer displays an F23 error code on the control panel. The dryer may not start, or it may start and then stop after a short period. Clothes may not dry properly, or the dryer might overheat.

Possible Causes:

Faulty thermistor: The thermistor itself is shorted internally.
Wire harness damage: Shorted wires in the harness connecting the thermistor to the control board.
Control board failure: A short on the control board affecting the thermistor circuit.
Loose connection: A wire disconnected and contacting metal chassis, creating a short.
Moisture: Moisture around the thermistor or wiring can create a short.

Solution:

1

Disconnect power to the dryer at the breaker panel. Verify no voltage is present using a multimeter.
2

Locate the thermistor. It's typically located on the blower housing, near the heating element assembly.
3

Visually inspect the wiring harness and connections to the thermistor for any signs of damage or corrosion. Repair or replace as needed.
4

Disconnect the thermistor and test its resistance using a multimeter. At room temperature (70-75°F), the thermistor should typically read between 10,000 and 50,000 ohms. A reading of 0 ohms indicates a short circuit.
5

If the thermistor is shorted, replace it with a new thermistor of the correct specification. Ensure the replacement is compatible with the Roper dryer model.
6

Check the wiring from the thermistor back to the control board using your multimeter in continuity mode. If there's continuity to ground, locate the short and repair the wiring.
7

If the thermistor and wiring are good, suspect a faulty control board. Replacing the control board might be necessary.

Safety Warning:

Always disconnect power to the dryer at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental energization. The dryer contains high voltage components that can cause serious injury or death.

Prevention:

Regularly clean the dryer vent duct to prevent lint buildup, which can cause overheating and stress the thermistor. Inspect the wiring harness for any signs of damage or wear during routine maintenance.

Expert Tip:

Many Roper dryers have a diagnostic mode. To enter the diagnostic mode, consult the service manual for your specific model. Often it involves pressing a sequence of buttons on the control panel, such as pressing the 'More Time' and 'Less Time' buttons simultaneously for a few seconds. The service mode can run component tests and often helps to pinpoint the source of the F23 error.

Frequently Asked Questions

•What is the typical resistance range for the thermistor at different temperatures?

The thermistor's resistance decreases as temperature increases. At room temperature (70-75°F), expect a reading between 10,000 and 50,000 ohms. At higher temperatures, this resistance will drop significantly.

•How can I locate the specific thermistor for my Roper dryer model?

Refer to the dryer's service manual or parts diagram. These resources typically provide detailed schematics and component locations. The thermistor is commonly located on the blower housing or near the heating element assembly.

•What are the risks of running the dryer with a faulty thermistor?

Running a dryer with a faulty thermistor can be dangerous. If the thermistor is shorted or malfunctioning, the dryer may overheat, potentially causing a fire hazard. It can also damage clothes and other dryer components.

Roper 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 for the thermistor at different temperatures?

•How can I locate the specific thermistor for my Roper dryer model?

•What are the risks of running the dryer with a faulty thermistor?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: