Whirlpool Duet Dryer Error Code L2: Troubleshooting... | appliancefaults.com

Technical Background:

The L2 error code indicates a problem with the thermistor circuit. The thermistor is a temperature-sensitive resistor that sends temperature readings to the Central Control Unit (CCU). The CCU uses this information to regulate the dryer's heating element. The MCU monitors the voltage drop across the thermistor, typically a 5V DC circuit. An L2 error indicates an out-of-range voltage.

Symptoms:

The dryer displays the L2 error code on the control panel. The dryer may stop mid-cycle, or not start at all. Clothes may not dry properly, or the dryer may overheat.

Possible Causes:

Open or shorted thermistor.
Faulty wiring harness or connections to the thermistor.
Defective Central Control Unit (CCU).
Blocked dryer vent causing overheating.
Loose connection at the CCU.
Incorrect thermistor installed.

Solution:

1

Unplug the dryer from the 120V AC outlet.
2

Locate the thermistor, typically on the blower housing. It's a small, white or black component with two wires. Use a 1/4-inch nut driver to remove the access panel if needed.
3

Disconnect the wires from the thermistor.
4

Using a multimeter set to ohms, measure the resistance of the thermistor. A normal thermistor should read around 10,000 ohms (10k ohms) at room temperature (70-75°F).
5

If the thermistor reads significantly higher or lower than 10k ohms, or shows an open or short circuit, replace it. Thermistors are typically inexpensive and can be sourced from appliance parts suppliers.
6

Inspect the wiring harness and connections to the thermistor for any damage or loose connections. Repair or replace as needed. Use electrical tape to insulate any repaired wires.
7

If the thermistor and wiring are good, the CCU may be faulty and require replacement or further diagnostics by a qualified technician. CCU replacement requires careful programming and is best left to licensed technicians.

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs. Lock out the breaker to prevent accidental power-up. Capacitors in the control board can hold a charge, so use caution when working with the electronics.

Prevention:

Clean the lint filter after every load. Regularly inspect and clean the dryer vent ductwork at least once a year to prevent lint buildup and overheating. Use a dryer vent cleaning kit available at most hardware stores.

Expert Tip:

After replacing the thermistor or CCU, run the dryer in a diagnostic mode to clear the error code. This typically involves pressing a specific sequence of buttons on the control panel (consult the service manual for the exact procedure) to reset the dryer's memory.

Frequently Asked Questions

•How do I access the dryer's diagnostic mode to clear the L2 error code?

The specific button sequence to enter diagnostic mode varies depending on the exact model of your Whirlpool Duet dryer. Consult the dryer's service manual or search online for the diagnostic mode entry instructions for your specific model number. The sequence often involves pressing a combination of buttons like 'Cycle Select,' 'Start,' and 'Cancel' in a specific order.

•If the thermistor tests okay, what voltage should I expect to see at the CCU connector when the dryer is running?

With the dryer running, you should typically see between 3-5V DC at the CCU connector pins associated with the thermistor circuit. The exact voltage will vary based on the dryer's internal temperature, as the thermistor's resistance changes with temperature, affecting the voltage drop.

•Where can I find the service manual for my specific Whirlpool Duet dryer model?

You can typically find the service manual for your Whirlpool Duet dryer model online by searching for the model number followed by 'service manual' or 'repair manual'. Websites like AppliancePartsPros.com or RepairClinic.com often have service manuals available for download, sometimes for free or for a small fee. You can also try contacting Whirlpool directly or visiting their website.

Whirlpool Duet Dryer Error Code L2: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the dryer's diagnostic mode to clear the L2 error code?

•If the thermistor tests okay, what voltage should I expect to see at the CCU connector when the dryer is running?

•Where can I find the service manual for my specific Whirlpool Duet dryer model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: