LG Dryer tE2 & tE3 Thermistor Repair in Port St. Lucie, FL

Quick symptom overview

LG DLEX, DLGX, and Sensor Dry electric and gas dryers display tE2 (Thermistor Short / High Temp) or tE3 (Thermistor Open / Low Temp) on front LED control displays when the electronic main control board (EBR73099901, EBR83610901, EBR62545301) detects out-of-spec resistance from Exhaust NTC Thermistor 6322DD9001A (supersessions 6322DD9001M, 6322DD9001B, EBG61107001).

The temperature monitoring and safety system consists of: Main Control Board → cabinet wiring harness → 2-pin locking connector (5.0 VDC reference circuit) → 10k Ω NTC thermistor 6322DD9001A mounted on blower housing cover → high-limit thermostat 6931EL3003D → heating element assembly (5301EL1001A). At standard room temperature (70°F / 21°C), normal thermistor resistance measures 10.0 kΩ. As hot exhaust air passes across the sensor, resistance decreases predictably (4.5 kΩ at 120°F). If resistance falls below 1.5 kΩ (overheating > 175°F), the control board halts the cycle and logs tE2. If internal thermistor leads fracture (resistance exceeds 100 kΩ), the board logs tE3.

tE2 code following 3 minutes of drying: Restracted exhaust vent ducting causing rapid thermal buildup around blower assembly. tE3 code immediately at power ON: Open circuit inside thermistor 6322DD9001A or loose wiring harness plug at PCB header CON3. Related LG dryer & appliance diagnostic guides: LG dryer dE / dE1 door switch guide, Electrolux dryer E64 heating guide, and Samsung dryer tE / tS thermistor guide. Local service page: LG appliance repair.

Safety: Disconnect 240V / 120V electrical power at main circuit breaker panel before removing cabinet panels or taking resistance measurements on internal wiring.

Step-by-step diagnostic hierarchy

1. Clean lint filter housing and check exhaust wall vent (Power OFF — simple check) — Turn off dryer power and inspect airflow pathways:

   • Pull out mesh lint screen, wash under hot water with dish soap to remove invisible fabric softener film, and dry thoroughly.
   • Inspect exterior wall exhaust vent hood: verify louvers open freely when dryer runs and duct is free of bird nests or crushed foil flex pipe.
   • Result: Restricted airflow causes rapid exhaust temperature spikes (> 175°F), forcing thermistor resistance below 1.5 kΩ and triggering tE2.

2. Measure Thermistor 6322DD9001A resistance at room temperature (Power OFF — meter check) — Unplug 240V power cord, remove rear cabinet lower access panel, and locate thermistor mounted on metal blower housing:

   • Unclip 2-pin wiring harness plug from thermistor 6322DD9001A.
   • Set multimeter to 20k Ω scale:
     • Measure across the 2 brass terminals on thermistor 6322DD9001A:
     • At 70°F (21°C) room temperature: Expected 9.0 kΩ to 11.5 kΩ (10.0 kΩ nominal).
     • At 120°F (49°C) elevated temperature: Expected 4.0 kΩ to 5.0 kΩ.
   • Result: ∞ Ω (Open circuit): Internal thermistor element severed → replace Exhaust Thermistor 6322DD9001A / 6322DD9001M (logs tE3). < 1.0 kΩ at 70°F: Replace thermistor immediately (logs tE2).

3. Measure 5 VDC reference power from Main Control Board (Power ON — live check) — Reclip harness plug, restore power breaker, and back-probe thermistor connector set to 20 VDC:

   • Pin 1 to Pin 2 across thermistor harness:
   • Expected reference voltage: 4.8 VDC to 5.2 VDC (5.0 VDC nominal).
   • Result: 0 VDC present: Trace wiring back to main board header CON3. If 5 VDC reference supply is missing at PCB header, replace Main Control Board Assembly EBR73099901 / EBR83610901.

4. Test High-Limit Thermostat 6931EL3003D continuity (Power OFF — safety check) — Keep power disconnected and test thermal safety cutouts on blower and heater housing:

   • Set meter to 200 Ω scale:
     • Measure across High-Limit Thermostat 6931EL3003D terminals:
     • Expected normal resistance: < 0.5 Ω (Closed circuit).
   • Result: ∞ Ω (Open): Thermal fuse tripped due to tE2 overheat condition → replace High-Limit Thermostat 6931EL3003D after clearing exhaust duct obstruction.

Multimeter and safety checks

Disconnect 240V/120V electrical power supply before removing rear access cover or taking thermistor resistance measurements.

Component / Test	Setup & Meter Range	Expected Normal Value	Fault / Failure Mode
Thermistor (at 70°F)	Across 2 brass terminals, 20k Ω	9.0 kΩ–11.5 kΩ (10.0 kΩ)	∞ Ω (open; logs tE3) or < 1.5 kΩ (shorted; logs tE2)
High-Limit Thermostat	Terminals on 6931EL3003D, 200 Ω	< 0.5 Ω (Closed)	∞ Ω (tripped open; element will not heat)
DC Vcc Power Supply	Across CON3 thermistor pins, 20 VDC	4.8 VDC–5.2 VDC (5.0 V)	0 VDC (failed 5V DC reference circuit on main PCB)
Wiring Harness Line	Pin-to-pin thermistor to CON3, 200 Ω	< 0.5 Ω per line	∞ Ω (broken wire lead inside cabinet harness loom)

Root cause vs repair breakdown

Observable Symptom	Root Cause / Faulty Part	Corrective Repair Action
tE3 code immediately at start	Open thermistor 6322DD9001A (∞ Ω)	Replace Exhaust Thermistor Assembly 6322DD9001A
tE2 code after 2–3 minutes	Clogged exhaust vent ducting causing overheat	Clean vent pipe; clear lint screen; replace thermistor if damaged
tE2 code with vent clear	Shorted thermistor element (< 1.0 kΩ at 70°F)	Replace Exhaust Thermistor Assembly 6322DD9001A
tE3 code, thermistor 10k Ω ok	Failed 5V DC reference circuit on PCB	Replace Main Control Board Assembly EBR73099901

FAQ

What do error codes tE2 and tE3 mean on an LG electric or gas dryer?

tE2 (Thermistor Error 2 / Shorted Circuit) and tE3 (Thermistor Error 3 / Open Circuit) indicate an Exhaust Thermistor Fault. The main electronic control board (EBR73099901 / EBR83610901) detects that resistance across NTC thermistor 6322DD9001A mounted on the blower housing dropped below 1.5 kΩ (tE2 short) or exceeded 100 kΩ (tE3 open).

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

Unplug dryer power cord and remove rear lower access panel or lint filter housing duct. Unclip 2-pin harness connector plug from thermistor 6322DD9001A. Set multimeter to 20k Ω scale: measure across the 2 male brass terminals; expected normal resistance at 70°F (21°C) room temperature is 9.0 kΩ to 11.5 kΩ (10.0 kΩ nominal).

Can a clogged lint vent cause tE2 or tE3 error codes on an LG dryer?

Yes. Severe lint buildup inside the exhaust duct or wall vent restricts airflow, causing exhaust temperatures to surge above 165°F (74°C). This thermal spike causes thermistor resistance to plunge below 1.5 kΩ, triggering a tE2 shorted thermistor fault.

Should I replace thermistor 6322DD9001A or main control board EBR73099901?

If thermistor resistance reads ∞ Ω (open), 0 Ω (shorted), or strays outside 8.0 kΩ to 12.0 kΩ at room temperature, replace Exhaust Thermistor 6322DD9001A / 6322DD9001M. If the thermistor tests at 10.0 kΩ and 5 VDC is missing from PCB header CON3, replace Main Control Board Assembly EBR73099901.

When to schedule professional service

If 240V main control board replacement, drum disassembly, or gas valve coil overhaul is required, certified LG dryer repair specialists are ready to help. Schedule LG dryer repair → or contact our technical service team.