Frigidaire Dryer High Limit Thermostat Tripping... | appliancefaults.com

Technical Background:

The dryer's MCU (Main Control Unit) monitors temperature via the thermistor and controls the heating element relay. The high-limit thermostat is a safety device that opens if the dryer overheats, cutting power to the heating element. Repeated tripping indicates an underlying problem causing excessive heat buildup.

Symptoms:

The high-limit thermostat on your Frigidaire dryer trips monthly, causing the dryer to stop heating.

Possible Causes:

Blocked dryer vent
Faulty blower motor
Defective heating element
Incorrect voltage supply
Damaged control board
Lint buildup inside the dryer cabinet

Solution:

1

Disconnect the dryer from the power outlet and turn off the breaker at the breaker panel.
2

Remove the rear panel of the dryer. Use a 1/4-inch nut driver.
3

Inspect the dryer vent for any obstructions. Clean thoroughly.
4

Test the blower motor for continuity. Replace if necessary.
5

Check the heating element for shorts to the dryer chassis using a multimeter. Resistance should be within the manufacturer's specifications (typically around 9-13 ohms). Replace if shorted or open.
6

Verify the voltage at the dryer receptacle. It should be 240V AC.
7

Inspect the high-limit thermostat for continuity. If tripped (open), replace. Make sure to address the root cause of the overheating.

Safety Warning:

Disconnect power before working on the dryer. Lock Out/Tag Out (LOTO) the breaker to prevent accidental power-up. 240V AC is present and can cause serious injury or death.

Prevention:

Clean the dryer vent at least annually. Clean the lint trap after every load. Inspect the inside of the dryer cabinet for lint buildup periodically and vacuum as needed.

Expert Tip:

On some Frigidaire models, holding down the Start/Pause and Cancel buttons simultaneously for 3 seconds enters a diagnostic mode that displays error codes. Use this to identify other potential issues.

Frequently Asked Questions

•What resistance should I expect from a good heating element?

A good heating element typically reads between 9 and 13 ohms. However, always refer to the manufacturer's specifications for your specific model.

•How do I clean the blower wheel inside the dryer?

Remove the blower housing cover. Use a brush and vacuum to remove lint buildup from the blower wheel blades and the housing. Ensure the wheel spins freely after cleaning.

•Where is the thermistor located and how do I test it?

The thermistor is usually located near the blower housing or on the heating element housing. Test it using a multimeter to measure resistance. The resistance value will vary depending on the temperature. Consult the service manual for the correct values at different temperatures.

Frigidaire Dryer High Limit Thermostat Tripping Repeatedly: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What resistance should I expect from a good heating element?

•How do I clean the blower wheel inside the dryer?

•Where is the thermistor located and how do I test it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: