Fisher & Paykel Dryer Error Code E3

The E3 error code on a Fisher & Paykel dryer indicates an open circuit condition in the inlet thermistor. 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 or heating system. When the control board detects that the thermistor circuit is open (meaning electrical continuity is broken and no valid resistance signal is being received), it throws the E3 fault and typically halts the drying cycle to prevent uncontrolled or unsafe heating conditions.

An open circuit in a thermistor circuit can result from a few distinct failure points. The thermistor itself may have failed internally, causing its resistance to go infinite rather than varying with temperature as intended. Alternatively, the wiring harness connecting the thermistor to the control board may have developed a break, a corroded connector, or a loose terminal that interrupts the signal path. In some cases, the thermistor may have been subjected to excessive heat or physical damage that caused its sensing element to fail.

Diagnosing this fault correctly requires isolating whether the problem is the thermistor component itself or the wiring leading to it. A technician should use a multimeter to check continuity and resistance across the thermistor terminals at the component level, then trace the circuit back through the harness connectors to the control board. If the thermistor reads open (no continuity or infinite resistance) at the component terminals, the thermistor requires replacement. If continuity is present at the component but lost further along the harness, the wiring or connector is the fault point.