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Appliance Error Codes

What Does tE Error Mean on LG LDFN4542S?

Error tE on LG LDFN4542S: Temperature sensor malfunction - abnormal temperature readings. Follow the troubleshooting steps below to diagnose and fix this dishwasher issue. The tE error code on your LG LDFN4542S dishwasher indicates a temperature sensor (thermistor) malfunction. The sensor is reporting abnormal temperature readings, either detecting water above 194°F (90°C) or providing inconsistent data to the control board. This error almost always requires professional service. As an immediate safety step, turn off the dishwasher and disconnect power at the circuit breaker. ## What Does tE Mean? The tE error code stands for “Thermal Error” and triggers when the LG LDFN4542S temperature sensor detects readings outside normal operating parameters. The thermistor is a small sensor that continuously monitors water temperature during all cycle phases, providing real-time data to the electronic control board. When the thermistor reports water temperatures above 194°F (90°C) or provides readings that fluctuate erratically, the control board interprets this as a dangerous condition and shuts down heating operations. On the LDFN4542S, proper temperature monitoring is critical for the QuadWash multi-motion spray arms and SmartThinQ Wi-Fi to operate safely and effectively. The tE error can indicate two distinct problems. First, the thermistor itself may have failed, causing it to send incorrect resistance values to the control board. A failed thermistor may report extremely high temperatures even when the water is cool, triggering the safety shutdown. Second, a stuck heater relay on the electronic control board may be causing the heating element to run continuously, actually overheating the water to dangerous temperatures. This scenario is more serious and can cause damage to the dishwasher tub, door seals, and internal plastic components if not addressed promptly. The LDFN4542S uses QuadWash technology with multi-motion spray arms that rotate back and forth while spinning to deliver powerful cleaning from multiple angles. Its SmartThinQ connectivity allows remote diagnostics through the LG ThinQ app. ## Possible Causes 1. Thermistor (temperature sensor) has failed and is sending incorrect resistance values 2. Wiring connection between the thermistor and control board is loose, corroded, or damaged 3. Control board heater relay stuck in the on position, causing actual water overheating above 194°F 4. Thermistor probe contaminated with scale or mineral deposits affecting its readings 5. Electronic control board failure in the temperature monitoring circuit 6. Water in the thermistor wiring connector causing intermittent short circuits 7. Previous power surge damaged the thermistor or its associated control board circuit ## Troubleshooting Steps | Step | Action | Expected Result | |------|--------|-----------------| | 1 | Turn off the dishwasher and disconnect power at the circuit breaker immediately | Power is completely disconnected from the unit | | 2 | Wait at least 30 minutes for any heated water inside the tub to cool down | Door area is cool to the touch before opening | | 3 | Restore power after 30 minutes and attempt to start a new cycle | Error may clear after a power reset if caused by a temporary glitch | | 4 | Monitor the initial fill and wash phases for any signs of overheating such as excessive steam | No unusual steam or heat detected during operation | The tE error can indicate actual water overheating, which poses burn risks. LG strongly recommends not opening the dishwasher door immediately when this error appears. Wait at least 30 minutes for water to cool before opening. If you detect a burning smell or see steam escaping from the door edges, disconnect power immediately and contact LG service. ## When to Call a Technician Contact LG authorized service if: - The tE error appears immediately or within the first few minutes of starting any cycle

  • You notice excessive steam coming from the dishwasher during operation
  • A power reset does not clear the error code
  • The dishwasher door feels extremely hot to the touch during what should be a cold water cycle
  • You detect a burning or melting plastic smell during operation Professional repair costs for tE issues typically range from $100 to $350 depending on the specific component that needs replacement and your service region. ## Frequently Asked Questions ### Is the tE error dangerous? The tE error can indicate actual water overheating above 194°F, which poses burn risks if you open the door. Always disconnect power and wait for the unit to cool before investigating. If you smell burning plastic, contact LG service immediately.

Can I reset the tE error by power cycling? A power reset (circuit breaker off for 30+ minutes) may clear the tE error if it was caused by a temporary sensor glitch. However, if the error returns on the next cycle, the thermistor or control board likely needs replacement by a technician.

Section titled “Can I reset the tE error by power cycling? A power reset (circuit breaker off for 30+ minutes) may clear the tE error if it was caused by a temporary sensor glitch. However, if the error returns on the next cycle, the thermistor or control board likely needs replacement by a technician.”

What is a thermistor and where is it located? A thermistor is a temperature-sensitive resistor that measures water temperature. In LG dishwashers, it is typically located near the heating element in the base of the tub or within the sump assembly. It requires professional access to inspect or replace.

Section titled “What is a thermistor and where is it located? A thermistor is a temperature-sensitive resistor that measures water temperature. In LG dishwashers, it is typically located near the heating element in the base of the tub or within the sump assembly. It requires professional access to inspect or replace.”

Could a control board problem cause the tE error? Yes. A stuck heater relay on the control board can cause the heating element to run continuously, actually overheating the water and triggering the tE error. This is a more serious condition that requires control board replacement by a certified technician. Reference: LG official support documentation (lg.com/us/support) and authorized service guides ### Is it safe to keep using my LG LDFN4542S with error tE? If error tE does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the dishwasher with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error tE on a LG LDFN4542S? Repair costs for error tE on the LG LDFN4542S dishwasher depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a LG-authorized service provider for an accurate estimate based on your specific situation. ### What does error code tE mean on a LG dishwasher? Error code tE on LG dishwasher models indicates Temperature sensor malfunction - abnormal temperature readings. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.

Section titled “Could a control board problem cause the tE error? Yes. A stuck heater relay on the control board can cause the heating element to run continuously, actually overheating the water and triggering the tE error. This is a more serious condition that requires control board replacement by a certified technician. Reference: LG official support documentation (lg.com/us/support) and authorized service guides ### Is it safe to keep using my LG LDFN4542S with error tE? If error tE does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the dishwasher with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error tE on a LG LDFN4542S? Repair costs for error tE on the LG LDFN4542S dishwasher depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a LG-authorized service provider for an accurate estimate based on your specific situation. ### What does error code tE mean on a LG dishwasher? Error code tE on LG dishwasher models indicates Temperature sensor malfunction - abnormal temperature readings. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.”