Electrolux Dryer Error Code 73

Error code 73 on an Electrolux dryer indicates an NTC2 open circuit fault. NTC stands for Negative Temperature Coefficient, referring to a thermistor that changes its electrical resistance in response to temperature changes. NTC2 is the second temperature sensor in the dryer's thermal monitoring system, and an "open" condition means the control board is detecting no signal from this sensor, as if the circuit has been broken or the sensor itself has failed. This prevents the dryer from accurately monitoring temperatures in the drum or exhaust path, triggering the fault to protect against potential overheating.

The most likely cause is a physical disconnection in the NTC2 wiring harness, such as a loose connector, a broken wire, or a connector that has vibrated free from the sensor or board terminal. This is the first thing to inspect: trace the NTC2 wiring from the sensor body to its connector on the main control board, checking for any obvious damage, corrosion, or separation at the terminals. If the wiring and connectors appear intact and secure, the thermistor itself may have failed internally, presenting an open circuit even though the physical connection looks fine.

If the wiring harness is confirmed to be in good condition and the NTC2 sensor tests as open or outside its expected resistance range when measured with a multimeter, the sensor must be replaced. However, if a new or known-good sensor still produces the error code after installation, attention should shift to the main control board, which may have a faulty input circuit for the NTC2 signal. Board-level faults in this context are less common than sensor or wiring issues but do occur.