GE Dryer Error Code E04

E04 means the outlet thermistor has gone open circuit, producing a voltage signal above the 4.8V maximum threshold for at least 5 minutes. The outlet thermistor is a temperature sensor located at the exhaust outlet of the dryer drum. Because the control board can no longer monitor exhaust temperatures, the dryer shuts down as a safety measure. The fault points to either a failed thermistor, broken wiring, or a loose connector in that sensor circuit.

No, you should not continue operating the dryer while this code is active. The outlet thermistor is part of the dryer's thermal protection system, and without a valid temperature reading at the exhaust, the control board cannot detect an overheating condition. Running the dryer in this state creates a potential fire risk and could cause additional damage to components.

If the repair only requires reseating a loose connector, there is no parts cost involved. If the thermistor itself has failed, the replacement part typically costs in the range of $15 to $40 depending on the specific model. If you hire a technician, expect to pay a service call fee plus labor, which commonly brings the total repair cost to somewhere between $80 and $180. Wiring harness damage can add to the cost depending on the extent of the repair needed.

Yes, this repair is within reach for a technically confident DIYer. The first steps are checking all wiring connectors in the outlet thermistor circuit and inspecting the harness for visible damage. If the wiring checks out, testing the thermistor's resistance with a multimeter will confirm whether the sensor itself has failed and needs replacement. Always unplug the dryer before beginning any inspection or repair work.

A power reset, such as unplugging the dryer for a minute and plugging it back in, may temporarily clear the code, but the fault will return if the underlying cause has not been corrected. Because the code requires the out-of-range voltage condition to persist for a full 5 minutes, an intermittent connection problem might not immediately retrigger the code, which can make diagnosis more difficult. The root cause in the thermistor or its wiring circuit must be repaired for the code to stay clear.