Amana Dryer High Limit Thermostat Blowing Repeatedly:... | appliancefaults.com

Technical Background:

The high-limit thermostat is a safety device designed to prevent the dryer from overheating. It is wired in series with the heating element. When the temperature inside the dryer exceeds a certain limit (typically around 250-300°F), the thermostat opens, cutting power to the heating element. The MCU monitors the thermostat via a thermistor reading or sometimes a direct circuit and will lock out the unit after a fault. Voltage typically seen is 120V AC during normal operation.

Symptoms:

The Amana dryer runs for a short period, then shuts off. The high-limit thermostat is found to be tripped or blown after each occurrence. The dryer may take longer than usual to dry clothes, and clothes may feel excessively hot.

Possible Causes:

Restricted exhaust vent causing excessive heat buildup.
Faulty blower motor not providing adequate airflow.
Defective heating element shorting to ground, creating over-temperature condition.
Lint buildup inside the dryer cabinet restricting airflow around the heating element.
Incorrect high-limit thermostat installed (wrong temperature rating).
Blocked lint screen causing airflow reduction.

Solution:

1

Disconnect the dryer from the 120/240V AC power source. Lock Out/Tag Out (LOTO) procedure.
2

Remove the rear panel of the dryer using a 1/4-inch nut driver. Locate the high-limit thermostat.
3

Visually inspect the thermostat and wiring for signs of burning or damage.
4

Using a multimeter, test the continuity of the thermostat. It should have continuity at room temperature. If open, replace.
5

Check the dryer vent for obstructions. Disconnect the vent from the back of the dryer and inspect the entire length. Clear any blockages.
6

Inspect the blower wheel for lint buildup. Remove the blower housing and clean the blower wheel thoroughly.
7

Verify the heating element is not shorted to the dryer chassis. Use a multimeter set to ohms. There should be very high resistance (ideally infinite) between the element terminals and the dryer frame.

Safety Warning:

Disconnect the dryer from power before performing any repairs. High voltage is present inside the dryer. Lock Out/Tag Out (LOTO) procedures must be followed. Wear appropriate safety glasses and gloves.

Prevention:

Clean the lint screen after every load. Inspect and clean the dryer vent at least once a year. Ensure the dryer vent is not crushed or kinked. Consider using a rigid metal vent instead of flexible foil vent for better airflow. Check and clean inside the dryer cabinet every year.

Expert Tip:

Many Amana dryers have a diagnostic mode. To access it, simultaneously press and hold the 'Start' and 'End Cycle' buttons for 3 seconds. Error codes can then be read on the display. Refer to the service manual for code definitions.

Frequently Asked Questions

•What is the proper temperature rating for the high-limit thermostat on my Amana dryer?

The correct temperature rating should be listed on the original thermostat. Typically, it's between 250-300°F. Refer to your dryer's service manual for the exact specification.

•How do I test the blower motor to ensure it's providing adequate airflow?

Check the blower wheel for free rotation and obstructions. Use a multimeter to check the motor windings for continuity and shorts to ground. If possible, measure the motor's amp draw while running and compare it to the nameplate rating. A significantly lower amp draw may indicate a failing motor.

•Where can I find the service manual for my Amana dryer?

You can usually find the service manual online by searching for the model number followed by 'service manual'. Websites like AppliancePartsPros.com or RepairClinic.com often have them available for download.

Amana Dryer High Limit Thermostat Blowing Repeatedly: Troubleshooting & Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper temperature rating for the high-limit thermostat on my Amana dryer?

•How do I test the blower motor to ensure it's providing adequate airflow?

•Where can I find the service manual for my Amana dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: