Amana Dryer High Limit Thermostat Tripping: Symptoms and... | appliancefaults.com

Technical Background:

The high-limit thermostat is a safety device designed to protect the dryer from overheating. When the temperature inside the dryer exceeds a certain limit, the thermostat opens, cutting off power to the heating element. The MCU monitors the thermostat and heating element relay circuits.

Symptoms:

The Amana dryer runs for a short period and then shuts off. It may restart after cooling down for a while. The clothes may not be drying properly, or they may be excessively hot.

Possible Causes:

Restricted airflow through the dryer.
Defective heating element.
Faulty blower motor.
Blocked vent duct.
Incorrect voltage supply to the dryer.
Failed temperature sensor (if equipped).

Solution:

1

Unplug the dryer from the outlet. Ensure the breaker is off at the breaker panel.
2

Remove the rear panel of the dryer to access the high-limit thermostat.
3

Use a multimeter to test the high-limit thermostat for continuity. It should show continuity when the dryer is cool. If it shows open, replace it.
4

Inspect the vent duct for any obstructions. Clean thoroughly using a vent brush.
5

Check the blower wheel for obstructions. Remove any lint or debris.
6

Inspect the heating element for shorts to ground. If shorted, replace the heating element.
7

Verify the voltage at the dryer outlet using a multimeter. It should read 240V AC (line to line) and 120V AC (line to neutral).

Safety Warning:

Disconnect power to the dryer before performing any repairs. Capacitors can hold a dangerous charge. Lock Out/Tag Out (LOTO) procedures MUST be followed. High voltage is present when the dryer is energized.

Prevention:

Clean the lint filter after every load. Inspect the vent duct at least once a year and clean it as needed. Avoid overloading the dryer.

Expert Tip:

Some Amana dryers have a service mode that allows you to run diagnostic tests. Check the tech sheet, usually located inside the dryer, for instructions on accessing the service mode. A common method is pressing and holding specific buttons simultaneously for a few seconds.

Frequently Asked Questions

•How do I test the heating element for a short to ground?

Disconnect the heating element wires. Set your multimeter to Ohms and test between each terminal of the heating element and the dryer chassis. A reading close to zero ohms indicates a short to ground.

•Where is the vent duct located, and how do I clean it?

The vent duct is typically located at the back of the dryer and runs to an outside vent. Disconnect the duct from the dryer and the wall. Use a vent brush and a vacuum to remove lint and debris.

•What voltage should I expect to see at the high limit thermostat?

When the dryer is running and calling for heat, you should see 240V AC at the high-limit thermostat before it. After the thermostat, the voltage will depend on whether the thermostat is open (0V AC) or closed (240V AC).

Amana 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 test the heating element for a short to ground?

•Where is the vent duct located, and how do I clean it?

•What voltage should I expect to see at the high limit thermostat?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: