Amana Dryer Overheating and Burning Lint Smell:... | appliancefaults.com

Technical Background:

Amana dryers utilize a Main Control Unit (MCU) to regulate heating cycles. The MCU monitors temperature sensors (thermistors, thermostats) and controls the heating element and motor. Voltage paths include 120V AC to the motor and control circuits, and 240V AC to the heating element. The thermistor provides variable resistance to the MCU, indicating the dryer's internal temperature. The MCU cuts off the heating element when the set temperature is reached based on the thermistor's readings.

Symptoms:

The homeowner observes that their Amana dryer is getting excessively hot during operation. Clothes are coming out feeling extremely warm, and there is a distinct burning lint smell emanating from the dryer.

Possible Causes:

Blocked dryer vent.
Faulty thermostat or thermistor.
Defective heating element.
Cycling thermostat failure.
Motor issues causing reduced airflow.

Solution:

1

Unplug the dryer from the outlet. Shut off the breaker.
2

Inspect the dryer vent for obstructions. Remove any lint buildup. Ensure the vent run is less than 25 feet with minimal bends.
3

Use a multimeter to test the continuity of the thermostats and thermistor. They should have continuity at room temperature (approx. 70-75°F). Replace if open.
4

Check the heating element for continuity. It should have a resistance reading between 9 and 13 ohms. If open, replace it.
5

Verify the cycling thermostat is functioning correctly. Use a multimeter to check for continuity. Replace if defective. Check the high-limit thermostat too.
6

Inspect the blower wheel for debris. Clean it if necessary.
7

If airflow is still poor, check the motor windings for shorts or open circuits using a multimeter. Replace the motor if faulty.

Safety Warning:

Disconnect power to the dryer by unplugging it from the outlet and switching off the breaker before performing any repairs. Lock Out / Tag Out (LOTO) procedures should be followed. The heating element operates on 240V AC, which can be lethal. Exercise caution when working with electrical components.

Prevention:

Clean the lint filter after every load. Annually inspect and clean the dryer vent, both inside and outside the house. Consider a licensed technician dryer vent cleaning service every 1-2 years, depending on usage.

Expert Tip:

On some Amana models, holding down the start button and another button (varies by model – consult the service manual) while powering on the dryer will enter a diagnostic mode. This can display error codes and allow component testing.

Frequently Asked Questions

•What is the correct resistance range for the thermistor on my Amana dryer?

The resistance range for the thermistor varies depending on the model. Consult the service manual or technical data sheet for your specific Amana dryer model. Typically, it will be several thousand ohms at room temperature (around 75°F), decreasing as the temperature increases. An open or shorted thermistor indicates failure.

•How do I safely discharge a capacitor in the dryer's control board before working on it?

Before working on the control board, disconnect power to the dryer. Use a 20,000-ohm resistor (at least 5 watts) with insulated alligator clip leads to safely discharge the capacitor. Connect one clip to each terminal of the capacitor for several seconds. Use a multimeter to verify the voltage across the capacitor is near zero before touching the board.

•What type of lubricant should I use on the dryer motor if it's making noise?

Use a high-temperature, non-detergent electric motor oil specifically designed for sleeve bearings. Avoid using WD-40 or similar penetrating oils, as they will evaporate quickly and not provide adequate long-term lubrication. Apply a few drops to the motor's oil ports, if present, or disassemble the motor and lubricate the bearings directly.

Amana Dryer Overheating and Burning Lint Smell: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the thermistor on my Amana dryer?

•How do I safely discharge a capacitor in the dryer's control board before working on it?

•What type of lubricant should I use on the dryer motor if it's making noise?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: