LG Dryer Stops Spinning Due to Overheating - Smart Home | digitalhomefaults.org

Technical Background:

LG dryers utilize thermistors to monitor exhaust and drum temperatures. These sensors feed data to the motor control unit (MCU). The MCU regulates the heating element and motor speed via triac circuits. Overheating triggers a safety shutdown to prevent fire hazards. Communication between the sensor, MCU, and display panel occurs via a serial communication bus.

Symptoms:

Dryer stops mid-cycle, accompanied by a burning smell and a flashing LED error code on the control panel (consult LG error code list). No spinning action observed. Internal temperature sensors exceed preset safety threshold (likely > 85°C). No physical obstructions visible in the drum.

Possible Causes:

Clogged lint trap restricting airflow, causing heat buildup.
Faulty thermistor providing incorrect temperature readings to the MCU.
Defective heating element continuously energized due to a stuck relay.
Blocked exhaust vent leading to backpressure and overheating. Common in Canadian winters due to snow/ice accumulation.
Worn drum belt causing increased friction and motor strain.
Malfunctioning centrifugal switch affecting motor operation.

Solution:

1

Disconnect power to the dryer at the breaker (240V). Verify voltage is zero using a multimeter before proceeding.
2

Inspect and clean the lint trap and exhaust vent system thoroughly. Check for obstructions in the ductwork leading outside.
3

Use a multimeter to test the thermistor resistance at room temperature and compare against LG's technical specifications for the specific model. Replace if out of range.
4

Examine the heating element for continuity and shorts to the dryer chassis. Replace if defective.
5

Check the drum belt for wear and tear. Replace if frayed or broken.
6

Test the centrifugal switch for proper operation. Replace if faulty.
7

After repairs, reconnect power and monitor the dryer during a test cycle. Verify proper temperature regulation and motor operation.

Safety Warning:

Never operate the dryer with a clogged lint trap or exhaust vent. This poses a serious fire hazard. Always disconnect power before performing any repairs. Do not bypass any safety devices. Ensure proper grounding of the dryer.

Prevention:

- Clean the lint trap after every load. - Inspect and clean the exhaust vent at least twice a year, especially before and after winter. - Check the drum belt periodically for wear. - Ensure adequate ventilation around the dryer. Avoid placing it in a confined space. - Schedule annual appliance maintenance with a qualified technician.

Expert Tip:

To access the thermistor, typically you'll need to remove the rear access panel. Take pictures before disconnecting any wires to ensure correct reassembly. Use an anti-static wrist strap when working on electronic components to prevent damage. Verify the exhaust vent is properly sealed to prevent moist air from entering the home and causing mould issues in Canadian homes.

Frequently Asked Questions

•How do I locate the thermistor in my LG dryer?

The thermistor is typically located on the blower housing or near the heating element assembly at the rear of the dryer. Refer to your LG dryer's service manual for the exact location.

•What is the typical resistance value of a healthy LG dryer thermistor?

The resistance value varies depending on the model. Consult the LG service manual, but a typical value at room temperature (25°C) is around 10-12 kOhms.

•How can I test the heating element for a short circuit?

Disconnect power. Use a multimeter set to continuity. Place one probe on a heating element terminal and the other on the dryer chassis. If the multimeter indicates continuity, the element is shorted and needs replacement.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

Frequently Asked Questions

•How do I locate the thermistor in my LG dryer?

•What is the typical resistance value of a healthy LG dryer thermistor?

•How can I test the heating element for a short circuit?

Related Questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: