Fisher & Paykel Dryer Error Code E4

E4 indicates that the outlet thermistor circuit is open, meaning the control board is receiving no signal from the temperature sensor monitoring the dryer's exhaust air. This is a fault condition that typically causes the dryer to stop operating. The problem may be a failed thermistor, damaged wiring, or a faulty connector in the sensor circuit.

No, you should not continue operating the dryer while the E4 fault is active. The outlet thermistor is part of the dryer's heat regulation and safety system, and running the appliance without a functioning temperature sensor could lead to uncontrolled overheating. The dryer typically shuts itself down when this fault is detected, and it should remain out of service until the fault is resolved.

Repair costs vary depending on whether the issue is a failed thermistor, damaged wiring, or simply a loose connector. A replacement thermistor part typically falls in the range of $20 to $60, while professional labor charges can add $80 to $200 depending on your location and service provider. If wiring harness replacement is also needed, costs will be higher.

A knowledgeable DIYer comfortable working with appliance wiring can inspect the thermistor connector and harness for obvious damage or a loose connection, which may resolve the fault without parts. However, if the thermistor itself has failed, replacing it requires correctly identifying the component location and safely disconnecting power before any work begins. If you are not confident working inside appliance wiring, a qualified technician is the safer choice.

A power reset by unplugging the dryer or cycling the circuit breaker may temporarily clear the displayed code, but the E4 error will return if the underlying fault in the thermistor circuit has not been repaired. Resetting is useful for confirming the fault is persistent and reproducible, but it is not a fix. The thermistor or its wiring must be inspected and corrected.