GE Dryer Error Code E4

The E4 code on a GE dryer indicates a fault with the inlet control thermistor, a temperature sensor that monitors incoming air before it reaches the drum. When this sensor fails or loses its electrical connection, the control board can no longer verify air temperature and triggers the E4 fault. The dryer will typically stop operating until the issue is resolved. Service test mode T06 is the starting point for diagnosing this fault.

Operating the dryer while the E4 fault is active is not recommended. The inlet control thermistor plays a role in temperature regulation, and running the dryer without a functioning sensor could lead to improper heat control. Most GE dryers will prevent normal operation when this code is present, but even if the dryer appears to run, continued use without a working thermistor risks overheating or incomplete drying cycles.

A power reset, such as unplugging the dryer for a few minutes, may temporarily clear the E4 code, but the fault will return if the underlying issue with the thermistor or its wiring has not been corrected. Resetting without repairing does not address the root cause. Running service test mode T06 after any reset can confirm whether the thermistor fault is still present before returning the dryer to service.

Experienced DIYers can attempt to diagnose this fault by inspecting the thermistor wiring harness for visible damage and loose connectors. If you have a multimeter, you can also test the thermistor resistance directly once the dryer is unplugged. However, accessing the thermistor typically requires partial disassembly, and running service test T06 requires familiarity with the dryer's diagnostic mode. If you are not comfortable with electrical testing, a professional technician is the safer option.

If only the inlet control thermistor needs replacement, the repair is generally on the lower end of appliance repair costs, with thermistor parts typically ranging from around 15 to 50 dollars depending on the model. If the fault turns out to be a wiring harness issue, costs may be limited to labor alone. A control board replacement, which is needed in rarer cases, can range from 100 to 300 dollars or more for parts. Adding professional labor, a full repair estimate could fall anywhere from 100 to 400 dollars depending on the root cause.