Samsung Dishwasher tE: Temperature Sensor (Thermistor) Fault

Error tE means the NTC thermistor temperature sensor is sending readings that the control board recognizes as electrically impossible. Samsung's board expects the thermistor to report a resistance within a defined window (based on the NTC's negative temperature coefficient curve) — values outside this window trigger tE.

The distinction from HE: tE is a sensor circuit fault (the board cannot read temperature at all), while HE is a heating performance fault (the board reads temperature correctly but it is not rising as expected). Both relate to the temperature sensing system, but their causes and repairs are different.

How the NTC Thermistor Works

The NTC (Negative Temperature Coefficient) thermistor (DD32-00010A) is a small sensor element potted in a metal probe, mounted in the sump area where it contacts wash water. Its resistance decreases predictably as temperature increases:

The board reads this resistance through a voltage divider circuit — a reference resistor on the board in series with the thermistor. The board converts the resulting voltage to a temperature using a calibration table in firmware. When the voltage falls outside the table's range (representing an open sensor, shorted sensor, or implausible temperature), tE is logged.

Four Failure Modes for tE

Mode 1: Open-Circuit Thermistor (45%)

The sensing element inside the probe cracks from thermal cycling (heating to 160F then cooling to room temperature, thousands of times). Once cracked, the element reads infinite ohms — the board sees maximum voltage from the divider, which maps to "sensor disconnected" and immediately posts tE.

Symptom: tE appears at the very start of a cycle, before any heating phase. The board polls the sensor during initialization — open circuit is detected in the first 10 seconds.

Mode 2: Corroded Connector (25%)

The 2-pin connector joining the thermistor to the wiring harness sits in the high-humidity zone beneath the tub. Condensation on the connector pins creates a high-resistance connection that distorts the thermistor reading. The sensor itself is fine, but the corroded junction adds variable resistance that shifts the reading outside the calibration window.

Symptom: tE appears intermittently — sometimes the code shows, sometimes the cycle runs fine. Vibration from the wash pump shakes the corroded connector, making contact intermittent.

Fix: Disconnect the 2-pin sensor connector. Clean both the male pins and female sockets with electrical contact cleaner (spray) and a cotton swab. Check that pins grip firmly. Reconnect and test. Cost: $0.

Mode 3: Thermistor Drift (20%)

The sensing element ages and its resistance characteristics shift — it still responds to temperature changes but the readings are offset from the original calibration. The board may tolerate minor drift for months (causing slightly off wash temperatures) before the drift exceeds the calibration table and triggers tE.

Symptom: Before tE appeared, dishes were slightly less clean or drying was slightly worse (the board was controlling heating based on drifted readings, over- or under-heating slightly). Then tE arrives as the drift crosses the threshold.

Mode 4: Harness Break (10%)

One of the two sensor wires breaks inside its insulation — the wire appears intact externally but is fractured internally. Usually occurs at a flex point where the harness bends around a structural member. The break creates either an open circuit (same as Mode 1) or an intermittent connection (same symptoms as Mode 2).

Diagnosis: Measure resistance at the board-side connector with the sensor still connected (access the board from behind the door panel). Compare to a measurement taken at the sensor connector. If the sensor reads correctly but the board-side reads open, the harness has a break between the two points.

Testing and Replacement

Sensor test:

1. Power off at breaker
2. Access the sensor from below (remove kick plate). The NTC probe is typically clipped into the sump wall or threaded into a port
3. Disconnect the 2-pin connector
4. Measure resistance across the sensor terminals at room temperature (68-72F): expect 40,000-50,000 ohms
5. Warm the sensor probe with your hand (grip it for 30 seconds): resistance should decrease noticeably (5-10% drop). If resistance stays fixed regardless of temperature, the sensing element is dead
6. Any reading of 0 ohms or infinite = definitive failure

Replacement:

1. Disconnect the old sensor from its mounting (twist counterclockwise if threaded, or release the retaining clip)
2. Note the position of the O-ring or grommet that seals the sensor port — this seal must be intact to prevent leaks
3. Install the new sensor (DD32-00010A, $18-$35). Ensure the O-ring seats properly
4. Reconnect the 2-pin connector and verify the locking tab clicks
5. Restore power and start a cycle — tE should not return

Parts and Pricing

Professional repair total (parts + labor + diagnostic): $90-$220

Why tE Is a Low-Cost, High-Impact Repair

The thermistor is one of the cheapest parts in the dishwasher ($18-$35), but its failure stops the entire machine. Samsung's control logic will not run heating cycles without valid temperature feedback — the board cannot know when to stop the heater, creating a potential overheating and fire risk if it ran blindly. This safety design means tE prevents all cycles that involve heating (which is nearly all of them).

Despite the dramatic impact (dishwasher completely non-functional), tE is often the simplest repair. A single sensor swap resolves the issue in 15-20 minutes for someone comfortable removing the kick plate and disconnecting a 2-pin connector.

tE vs. tE1, tE2, tE3: Sub-Codes on Some Models

Certain Samsung models provide sub-codes:

• tE1 — Main wash thermistor fault (the primary sensor discussed above)
• tE2 — Duct thermistor fault (on models with a separate drying duct sensor)
• tE3 — Steam generator thermistor fault (on models with a steam wash feature)

If your display shows just "tE" without a digit, it refers to the main wash thermistor. SmartThings on Wi-Fi-equipped models may show the more specific sub-code.

Samsung Dishwasher Diagnostic Mode for tE

Enter diagnostic mode (hold Start/Cancel 3 seconds). Navigate to the sensor test phase — the board reads the current thermistor resistance and converts it to temperature. The displayed value should match room temperature approximately (±5F). A reading of 0F or 999F confirms the sensor is electrically failed. SmartThings-connected models show the temperature reading in the app under device diagnostics.

tE and the Temperature-Dependent Wash Cycle

Samsung dishwashers adjust multiple cycle parameters based on thermistor input:

• Fill volume (cold water requires more fill for proper dilution)
• Heater run time (lower inlet temperature = longer heating phase)
• Detergent dispenser release timing (optimized for water temperature)
• Drying fan activation timing (begins when rinse temperature reaches target)

When the thermistor fails and tE is active, the board cannot make any of these temperature-dependent decisions. This is why Samsung locks out most cycles with tE — running without temperature feedback produces unpredictable results.

Replacing Both Sensor and Harness Preventively

When replacing the NTC thermistor (DD32-00010A), consider also replacing the sensor harness (DD82-01068A, $10-$18) if the original harness shows any signs of brittleness or discoloration. The harness runs through the humid under-tub environment and degrades at a similar rate to the sensor. A $10 harness replacement now prevents a second service call when the old harness fails a few months after the sensor swap.

Samsung dishwasher tE stopping all cycles? The sensor is a $18-$35 part with a 15-minute install. Our technicians confirm the diagnosis and swap it on the first visit. Schedule service.