Amana Dryer: Lint Filter Light Stays On After Cleaning -... | appliancefaults.com

Technical Background:

Modern dryers use a main control unit (MCU) to monitor various sensors, including the lint filter sensor. The sensor provides feedback to the MCU, which then illuminates the lint filter light when a blockage is detected or suspected. The voltage path typically involves a 5V DC signal from the MCU to the sensor, and a return signal back to the MCU. Changes in resistance or voltage indicate a clogged filter.

Symptoms:

The lint filter light on your Amana dryer remains illuminated even after you have thoroughly cleaned the lint filter. This indicates the dryer still thinks the filter is clogged.

Possible Causes:

Faulty lint filter sensor
Partially blocked vent causing back pressure
Wiring issue between the sensor and the main control unit (MCU)
Defective MCU relay or logic error
Excessive lint build-up in the dryer cavity beyond the filter
Static electricity interference with the sensor

Solution:

1

Unplug the dryer from the 120V AC outlet.
2

Locate the lint filter housing and inspect the lint filter sensor. It's usually a small thermistor or optical sensor.
3

Use a multimeter to check the continuity of the lint filter sensor. A normal reading is usually a closed circuit when the filter is installed and no excessive lint present.
4

Disconnect the wires from the lint filter sensor and check the voltage at the connector. It should read approximately 5V DC if the MCU is sending power. Check for continuity between the connector and the MCU using the wiring diagram.
5

Inspect the vent hose and ductwork for blockages. Clear any obstructions. Ensure the vent run is less than the maximum length specified in the dryer's manual (typically 25 feet with minimal elbows).
6

Check the dryer cavity for excessive lint buildup. Vacuum any lint accumulation.
7

If the sensor, wiring, and venting are clear, replace the MCU. This is often the final solution if the dryer's logic is faulty.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. This appliance operates at 120V AC, which can cause serious injury or death. Lock Out/Tag Out (LOTO) procedures should be followed.

Prevention:

Clean the lint filter after every load. Inspect and clean the vent ductwork at least once a year. Use rigid or semi-rigid metal ductwork instead of flexible plastic or foil ducts, as these tend to trap more lint.

Expert Tip:

Some Amana dryers have a diagnostic mode. Press and hold the Start/Pause button for 3 seconds, then press the cycle selector knob rapidly three times. This may show error codes related to the lint filter sensor.

Frequently Asked Questions

•Where is the lint filter sensor located on my Amana dryer?

The lint filter sensor is typically located inside the lint filter housing, either near the filter itself or at the bottom of the housing. Consult your dryer's parts diagram for the exact location.

•How do I test the vent for blockages?

Disconnect the vent from the back of the dryer and visually inspect it for obstructions. You can also use a vent cleaning brush or vacuum cleaner to remove lint. Check the outside vent termination for obstructions as well.

•Where can I find the wiring diagram for my Amana dryer?

The wiring diagram is usually located inside the dryer, often taped to the back panel or inside the control panel. You can also find it online by searching for your dryer's model number followed by "wiring diagram."

Amana Dryer: Lint Filter Light Stays On After Cleaning - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the lint filter sensor located on my Amana dryer?

•How do I test the vent for blockages?

•Where can I find the wiring diagram for my Amana dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: