Fisher & Paykel Dryer Error Code E5

The E5 error code on a Fisher & Paykel dryer indicates an inlet thermistor signal failure. The inlet thermistor is a temperature-sensing resistor positioned at the air intake path of the dryer, responsible for monitoring the temperature of air entering the drum. The dryer's control board reads the resistance value produced by this thermistor to regulate heating and ensure safe operation. When the signal falls outside the expected range, either too high, too low, or completely absent, the control board interprets this as a sensor failure and triggers the E5 fault.

Thermistors are negative temperature coefficient (NTC) devices, meaning their electrical resistance decreases as temperature increases. A functioning inlet thermistor will produce a specific resistance range at a given ambient temperature. If the thermistor has failed open-circuit, the control board receives no signal. If it has failed short-circuit, it reads an unrealistically low resistance. Either condition causes the E5 code. Wiring faults, including broken connectors, corroded terminals, or damaged harness sections between the thermistor and control board, can produce the same symptom without the thermistor itself being defective.

In addition to component failure, the fault can sometimes be triggered by moisture intrusion into the connector at the thermistor, or by a control board that has lost the ability to accurately read the sensor input. Proper diagnosis requires measuring the thermistor's resistance with a multimeter and comparing it against the expected value at room temperature, as well as inspecting the wiring harness for continuity and signs of damage.