LG Dishwasher tE Error & Thermistor Repair in Port St. Lucie

Quick symptom overview

LG QuadWash, Direct Drive, and Studio series built-in dishwashers display tE (Thermistor Sensor Error) or tE1 (Water Temperature Feedback Out of Range) on top or front digital control displays when the main electronic control PCB (EBR83587201, EBR83587202, EBR78637901) detects an open circuit, shorted NTC element, or harness disconnect on Sump Water NTC Thermistor 6322DD9001A (supersessions 6322DD9001B, AG6322DD9001, 6322DD9001C).

The wash water temperature sensing loop consists of: Main Control PCB → cabinet wiring harness → 2-wire locking molex connector → 48.0 kΩ NTC thermistor 6322DD9001A inserted into the lower plastic sump well → flow-through heater assembly (5301DD1001A). During wash and rinse cycles, the main PCB monitors thermistor resistance to regulate heater relay cycles between 120°F (Normal Wash) and 160°F (Sanitize Cycle). As water warms, NTC thermistor resistance decreases in a negative temperature coefficient curve (48.0 kΩ at 77°F / 25.0 kΩ at 100°F / 16.0 kΩ at 120°F / 8.5 kΩ at 145°F). If internal sensor wires sever or short against grease, the board detects an out-of-range resistance (< 2 kΩ or > 200 kΩ) and halts wash operations.

tE code immediately at cycle start: Thermistor wire unclipped, harness broken under sump base, or thermistor element open (∞ Ω). tE1 code during main wash heating phase: Thermistor resistance drifted out of thermal calibration curve or moisture short inside sensor plug. Related LG dishwasher & appliance diagnostic guides: LG dishwasher AE leak sensor guide, LG washer OE drain timeout guide, and Bosch dishwasher E23 drain pump guide. Local service page: LG appliance repair.

Safety: Turn off electrical power at 15A home circuit breaker panel and shut off hot water valve before removing lower toe kick panel or handling 120V main board wiring.

Step-by-step diagnostic hierarchy

1. Inspect sump area and thermistor wire plug (Power OFF — simple check) — Open door, remove lower dish rack, and lift out sump filter assembly:

   • Remove bottom metal toe kick panel and sound insulation shield.
   • Locate black 2-wire thermistor 6322DD9001A clipped into front left side of lower sump bowl.
   • Inspect 2-pin molex connector for discolored plastic, water droplets from sump seal leak, or loose harness wires.

2. Measure NTC thermistor resistance with multimeter (Power OFF — meter check) — Unplug dishwasher power cord or switch off 15A circuit breaker:

   • Unclip 2-pin harness connector from thermistor 6322DD9001A.
   • Set multimeter to 200k Ω (200,000 Ω) scale:
     • Measure across 2 terminals on thermistor 6322DD9001A:
     • 77°F (Room Temp / 25°C): Expected 43.0 kΩ to 53.0 kΩ (48.0 kΩ nominal).
     • 120°F (Warm Water Sump / 49°C): Expected 14.5 kΩ to 17.5 kΩ (16.0 kΩ nominal).
     • 145°F (Sanitize Wash Temp / 63°C): Expected 7.8 kΩ to 9.2 kΩ (8.5 kΩ nominal).
   • Result: ∞ Ω (Open circuit): Internal NTC wire broken → replace Thermistor Sensor Assembly 6322DD9001A / 6322DD9001B. < 2.0 kΩ (Shorted): Replace sensor assembly immediately.

3. Measure harness wire continuity to Main Control PCB (Power OFF — harness check) — Access main control board EBR83587201 located in lower right door frame / base pan:

   • Unclip thermistor harness connector from board header NA4 / THERMISTOR:
     • Set meter to 200 Ω scale:
     • Measure pin-to-pin between thermistor connector plug and header NA4 terminals:
     • Expected wire line continuity: < 0.5 Ω per wire.
     • Measure each wire pin to metal dishwasher frame:
     • Expected chassis ground isolation: ∞ Ω (No short to ground).
   • Result: > 1.0 Ω or ∞ Ω: Wire lead broken or corroded under lower door hinge area → repair harness wire lead or replace lower cabinet harness loom.

4. Verify Main Control PCB EBR83587201 (Power ON — live check) — If thermistor measures 48 kΩ at 77°F and harness continuity is < 0.5 Ω:

   • Reclip harness plugs into thermistor and main board header NA4.
   • Restore 15A power and initiate a short Express Wash test cycle.
   • Result: tE / tE1 code recurs with good 48 kΩ sensor: ADC sensing circuit on main board damaged → replace Main Control PCB Assembly EBR83587201 / EBR83587202.

Multimeter and safety checks

Disconnect 120V power supply before taking resistance measurements on thermistor terminals or unplugging main PCB headers.

Component / Test	Setup & Meter Range	Expected Normal Value	Fault / Failure Mode
Thermistor 6322DD9001A (77°F)	Across 2 thermistor terminals, 200k Ω	43.0 kΩ–53.0 kΩ (48.0 kΩ)	∞ Ω (open thermistor; logs tE) or < 2.0 kΩ (shorted)
Thermistor 6322DD9001A (120°F)	Warm water sump test, 200k Ω	14.5 kΩ–17.5 kΩ (16.0 kΩ)	Resistance fails to drop as wash water warms up
Harness Wire Line	Pin-to-pin thermistor to PCB NA4, 200 Ω	< 0.5 Ω per wire	∞ Ω (broken wire lead inside lower door hinge harness)
Harness to Chassis Ground	Pin to metal tub frame, 200k Ω	∞ Ω (Open)	< 10 kΩ (harness insulation chafed against frame)

Root cause vs repair breakdown

Observable Symptom	Root Cause / Faulty Part	Corrective Repair Action
tE code, thermistor reads ∞ Ω	Open NTC thermistor element inside sensor	Replace NTC Thermistor Assembly 6322DD9001A / 6322DD9001B
tE code, thermistor plug corroded	Sump seal leak dripping on plug terminals	Repair sump seal; replace NTC Thermistor 6322DD9001A
tE1 code, thermistor reads 5 kΩ at 77°F	Thermistor drifted off resistance calibration	Replace NTC Thermistor Sensor 6322DD9001A
tE code, thermistor reads 48 kΩ, harness OK	Failed ADC input circuit on main board	Replace Main Control PCB Assembly EBR83587201

FAQ

What does error code tE or tE1 mean on an LG dishwasher?

tE / tE1 (Thermistor Error) indicates a Wash Water NTC Thermistor Circuit Failure. The electronic main control board (EBR83587201 / EBR83587202) detects that thermistor resistance from sensor 6322DD9001A dropped below 2.0 kΩ (shorted) or exceeded 200 kΩ (open circuit).

How do I test LG dishwasher thermistor 6322DD9001A with a multimeter?

Unplug dishwasher and remove lower front access kick plate. Locate thermistor 6322DD9001A clipped into the lower sump housing beside turbidity sensor. Unclip 2-wire harness plug. Set multimeter to 200k Ω (200,000 Ω) scale: expected normal resistance at room temperature (77°F / 25°C) is 43 kΩ to 53 kΩ (48 kΩ nominal); at 120°F hot wash temp, resistance drops to 16 kΩ.

Can a faulty heating element cause tE error code on LG QuadWash dishwashers?

No. Heating element failure (5301DD1001A open element) typically triggers error code HE. However, if the heating element short-circuits to the stainless tub wall, electrical noise can corrupt the 5V thermistor signal and trigger tE.

Should I replace thermistor 6322DD9001A or main control board EBR83587201?

If thermistor 6322DD9001A measures open (∞ Ω), shorted (< 2.0 kΩ), or drifted off calibration (e.g. 5.0 kΩ at 77°F), replace NTC Thermistor Assembly 6322DD9001A / 6322DD9001B. If thermistor reads 48 kΩ at 77°F and harness wire continuity reads < 0.5 Ω to main board header NA4, replace Main Control Board EBR83587201.

When to schedule professional service

If main control PCB replacement, under-counter removal, or lower sump seal overhaul is required, certified LG dishwasher technicians are ready to assist. Schedule LG dishwasher repair → or contact our technical service team.