Electrolux Dryer Error Code E73

E73 indicates a problem with the NTC 2 inlet control thermistor, the sensor that monitors incoming air temperature. The control board has detected that the sensor signal is missing, open, or out of range. The fault can be caused by a bad thermistor, a loose connector at terminals J4-3 and J4-4, a broken wire, or in some cases a faulty main control board.

A reset may temporarily clear the E73 code, but it will return if the underlying fault is not repaired. The control board triggers E73 each time it detects an invalid signal from the NTC 2 thermistor, so the code will come back as soon as the dryer runs another cycle. Proper diagnosis and repair of the thermistor, wiring, or board is required for a lasting fix.

Repair costs vary depending on which component is at fault. A replacement inlet thermistor is generally an inexpensive part, typically in the range of $15 to $40. If the main control board is the cause, parts alone can run $100 to $250 or more, with professional labor adding to that total. Diagnosing the fault yourself with a multimeter before purchasing parts can help avoid unnecessary expenses.

Start by measuring resistance between terminals J4-3 and J4-4 on the wiring connector with a multimeter. The reading should be between 49 KΩ and 63.7 KΩ at room temperature. If the reading is out of range or shows an open circuit, replace the NTC 2 thermistor. If the thermistor reads correctly, inspect the wiring harness and connector for damage or corrosion before considering a main board replacement.

Operating the dryer with an active E73 code is not recommended. The inlet thermistor provides temperature data the control board uses to regulate the heating system. Without a reliable reading from that sensor, the dryer cannot properly control heat, which could result in overheating or inadequate drying performance. It is best to diagnose and resolve the fault before continued use.