LG Dryer: Buzzing Noise When Start Button Pressed -... | digitalhomefaults.org

Technical Background:

The LG dryer utilizes a 240V AC supply for the heating element and motor. A low-voltage DC control circuit manages the user interface, sensors, and motor control relay. The 'Start' button triggers a sequence that activates the motor control relay, energizing the motor windings. Buzzing sound may indicate relay chatter or a failed motor winding.

Symptoms:

Audible buzzing noise emanates from the dryer unit immediately upon pressing the 'Start' button. No error code displayed on the dryer's LED panel. The dryer drum does not initiate rotation. No apparent motor engagement. No change observed in the LG ThinQ app status.

Possible Causes:

Faulty motor start relay: Relay contacts may be degraded, causing arcing and buzzing.
Motor winding failure: Shorted or open motor windings draw excessive current, causing the relay to chatter or the motor to hum.
Capacitor failure: Start capacitor for the motor is failing, preventing proper motor startup.
Foreign object obstruction: An object lodged in the blower wheel or drum mechanism prevents motor rotation, leading to a buzzing sound due to motor overload.
Voltage supply issue: Insufficient voltage (brownout condition, especially common during peak winter load) may prevent proper relay operation.
Control board malfunction: The control board may be sending an incorrect signal to the motor relay.

Solution:

1

Disconnect the dryer from the electrical supply by switching off the appropriate 240V breaker in the electrical panel. Verify power is off with a multimeter at the dryer outlet.
2

Access the dryer's internal components by removing the rear access panel. Refer to the LG service manual for specific disassembly instructions.
3

Visually inspect the motor start relay for signs of damage, such as burnt contacts or a cracked casing. Replace the relay if damage is evident.
4

Using a multimeter, test the motor windings for continuity. Compare the readings to the values specified in the LG service manual. Replace the motor if windings are open or shorted.
5

Check the start capacitor. Use a capacitor tester or multimeter with capacitance measurement capability to verify the capacitor's value. Replace the capacitor if its value is outside the specified range.
6

Inspect the blower wheel and drum mechanism for any obstructions. Remove any foreign objects.
7

After making repairs, reconnect the dryer to the electrical supply and test its operation. Monitor the motor for any unusual noises or vibrations.

Safety Warning:

Working with electrical appliances can be hazardous. Always disconnect the appliance from the power supply before performing any repairs. Ensure the dryer is properly grounded. Incorrect repairs can lead to electrical shock or fire. If unsure, engage a qualified appliance technician.

Prevention:

- Regularly clean the dryer lint filter after each use to prevent lint buildup, which can cause motor overheating. - Schedule annual dryer vent cleaning to ensure proper airflow and prevent motor overload. Consider using a local Canadian service, like Dryer Vent Wizard. - Periodically inspect the dryer's power cord and outlet for signs of damage. Replace any damaged components. - Monitor the dryer's performance for any changes in noise level or drying time. Address any issues promptly. - Ensure stable input voltage, especially during peak winter loads. Consult with an electrician if voltage fluctuations are suspected.

Expert Tip:

If the buzzing sound is intermittent, try tapping the motor start relay with the handle of a screwdriver (while the dryer is disconnected from power). If the buzzing stops temporarily, it suggests a faulty relay. This is a temporary diagnostic shortcut only, and the relay MUST be replaced.

Frequently Asked Questions

•What tools do I need to diagnose a buzzing noise?

You will need a multimeter, socket set, screwdrivers (Phillips and flathead), wire strippers, and potentially a capacitor tester.

•How do I find the LG service manual for my specific model?

The service manual can be located by searching online with your LG model number followed by "service manual". Many online resources and part suppliers have these documents available as PDF downloads.

•What is a motor start relay, and where is it located in the dryer?

The motor start relay is an electrical switch that sends power to the motor. It is usually located near the motor assembly or on the control board. It is typically a small, rectangular component with multiple terminals connected to wires.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

Frequently Asked Questions

•What tools do I need to diagnose a buzzing noise?

•How do I find the LG service manual for my specific model?

•What is a motor start relay, and where is it located in the dryer?

Related Questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: