Admiral Dryer: High Limit Thermostat Tripping - Symptoms... | appliancefaults.com

Technical Background:

The dryer's Main Control Unit (MCU) monitors temperature using thermistors and thermostats. The high limit thermostat is a safety device that opens the circuit if the dryer overheats. When the thermostat trips, it cuts power to the heating element, preventing a fire. The voltage path typically runs from the power source through the heating element, then through the high limit thermostat, and back to the MCU or neutral. If airflow is restricted, the temperature rises too quickly, causing the thermostat to trip.

Symptoms:

The Admiral dryer runs for a short period and then shuts off. It may restart after cooling down. You might smell a burning odor or notice clothes taking longer to dry. The high limit thermostat is tripping repeatedly, cutting off power to the heating element.

Possible Causes:

Restricted airflow through the dryer vent.
Clogged lint filter.
Faulty blower motor.
Defective heating element.
Malfunctioning thermistor.

Solution:

1

Unplug the dryer from the 120V AC outlet. Always lockout/tagout the breaker.
2

Disconnect the dryer vent from the back of the unit. Check for obstructions. Clear any lint buildup.
3

Remove the lint filter and clean the lint filter housing with a vacuum.
4

Locate the high limit thermostat on the blower housing or heating element housing. Using a multimeter, test for continuity. It should have continuity at room temperature.
5

If no continuity, replace the high limit thermostat. Ensure the new thermostat is rated for the correct temperature.
6

Inspect the heating element for any signs of damage, such as breaks or shorts. Test the element for proper resistance (typically 9-13 ohms). Replace if necessary.
7

Reassemble the dryer, reconnect the vent, and plug it back into the outlet.

Safety Warning:

Disconnect power to the dryer before performing any repairs. The dryer operates on 240V AC and 120V AC circuits. Lockout/Tagout the breaker to prevent accidental electrocution. Allow the heating element to cool before handling it.

Prevention:

Clean the lint filter after every load. Inspect and clean the dryer vent at least once a year. Check the blower wheel for debris and clean it as needed. Ensure the dryer has adequate airflow around it.

Expert Tip:

Some Admiral dryers have a service mode. Consult the service manual for your specific model to access diagnostic codes and perform component tests. Often, a stuck relay on the control board can cause continuous heating, leading to overheating. Check the relays using a multimeter for shorts.

Frequently Asked Questions

•How do I access the high limit thermostat on my Admiral dryer?

Typically, you'll need to remove the rear panel or the front panel of the dryer to access the blower housing or heating element housing where the thermostat is located. Refer to your dryer's service manual for specific instructions.

•What is the proper way to clean a dryer vent?

You can use a dryer vent cleaning kit with a long brush attachment to scrub the inside of the vent. Alternatively, you can hire a professional dryer vent cleaning service to ensure thorough cleaning.

•How do I test the heating element for continuity and resistance?

Disconnect the power to the dryer. Disconnect the wires from the heating element terminals. Set your multimeter to the ohms setting. Touch the probes to the terminals. A reading of 9-13 ohms indicates the element is likely good. An open circuit (no reading) indicates a faulty element.

Admiral Dryer: High Limit Thermostat Tripping - Symptoms and Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the high limit thermostat on my Admiral dryer?

•What is the proper way to clean a dryer vent?

•How do I test the heating element for continuity and resistance?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: