Hotpoint Dryer: Lint Filter Light Stays On After... | appliancefaults.com

Technical Background:

The dryer's main control unit (MCU) monitors the lint filter sensor. The sensor typically operates on a low voltage (5V DC) circuit. When the lint filter is clean, the sensor provides a specific resistance value to the MCU. If the lint filter is clogged or the sensor is malfunctioning, the resistance changes, triggering the lint filter light.

Symptoms:

The lint filter light on your Hotpoint dryer remains illuminated even after the lint filter has been thoroughly cleaned. This indicates a potential issue with the lint filter sensing circuit.

Possible Causes:

Blocked exhaust vent
Faulty lint filter sensor
Damaged wiring harness to the sensor
Malfunctioning main control unit (MCU)
Grounding issue within the dryer chassis

Solution:

1

Unplug the dryer from the outlet.
2

Inspect the lint filter sensor for damage or debris. Clean with a soft brush if necessary.
3

Using a multimeter, check the continuity of the lint filter sensor. Refer to the dryer's wiring diagram for the correct terminals.
4

Examine the wiring harness connecting the lint filter sensor to the MCU for any breaks, shorts, or loose connections. Repair or replace as needed.
5

Check the exhaust vent for blockages. Disconnect the vent from the dryer and the wall, and remove any lint buildup. Use a vent cleaning kit to thoroughly clean the entire vent system.
6

Verify the dryer is properly grounded. Check the ground wire connection at the breaker panel and at the dryer chassis. Use a multimeter to measure the voltage between the neutral and ground wires; it should be close to 0V AC.
7

If all other components check out, replace the main control unit (MCU).

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs. Use Lock-Out Tag-Out (LOTO) procedures. Be aware of potentially high voltage (120V AC) present in the dryer's electrical components.

Prevention:

Clean the lint filter after every load. Inspect the exhaust vent at least twice a year for lint buildup. Ensure proper airflow around the dryer. Periodically check wiring connections for tightness.

Expert Tip:

Some Hotpoint dryers have a diagnostic mode. Refer to the service manual to activate the diagnostic mode and check for error codes related to the lint filter sensor. This can help pinpoint the source of the problem.

Frequently Asked Questions

•How do I locate the lint filter sensor on my Hotpoint dryer?

The lint filter sensor is typically located near the lint filter housing, either in the duct or on the housing itself. Refer to your dryer's parts diagram for the exact location.

•What resistance value should I expect from a functioning lint filter sensor?

The resistance value varies depending on the specific Hotpoint dryer model. Consult the dryer's service manual or wiring diagram for the correct resistance range.

•If the MCU is faulty, will replacing it definitely fix the lint filter light issue?

Replacing the MCU will likely fix the issue if all other components have been ruled out. However, ensure the new MCU is properly programmed or configured for your specific dryer model to avoid further problems.

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

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I locate the lint filter sensor on my Hotpoint dryer?

•What resistance value should I expect from a functioning lint filter sensor?

•If the MCU is faulty, will replacing it definitely fix the lint filter light issue?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: