GE Dryer Error Code tE4

The tE4 error code on a GE dryer indicates a fault with the outlet thermistor, which is the temperature-sensing component that monitors air temperature at the dryer's exhaust outlet. The control board triggers this code when the thermistor's signal voltage reads above 4.8V or below 0.2V continuously for more than 5 seconds. Under normal operating conditions, the thermistor produces a voltage signal that varies with temperature, staying well within those boundary thresholds. A reading outside this range tells the control board the sensor circuit has either lost continuity or developed a short, making accurate temperature monitoring impossible.

The outlet thermistor is a negative temperature coefficient (NTC) resistor, meaning its resistance decreases as temperature rises. The control board interprets the resulting voltage drop across the circuit to determine exhaust temperature. When the thermistor circuit goes open, voltage spikes toward the upper supply rail, which can push the signal above 4.8V. When the circuit shorts to ground, voltage collapses toward zero, pushing it below 0.2V. Both conditions are outside the valid sensing range and will trigger tE4.

The most likely causes are a disconnected or damaged thermistor connector, broken wiring in the thermistor harness, or a failed thermistor itself. Because the first diagnostic step is to inspect the connector and wiring, technicians should start there before condemning the sensor. Connector pins can back out or corrode, particularly in the high-heat environment near the exhaust duct, and a simple reseating of the connector will sometimes resolve the fault immediately.