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Error code reference

Electrolux Dryer Error Code E73

NTC 2 (Inlet Control Thermistor) open, disconnected, or main board fault.

Electrolux codesElectrolux dryer codes

NTC 2 (Inlet Control Thermistor) open, disconnected, or main board fault.

First step from the service manual

Measure resistance between terminals J4-3 and J4-4 wiring connector; value should be between 49 KΩ to 63.7 KΩ at 20–25°C.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E73 means on a Electrolux dryer

The E73 error code on an Electrolux dryer indicates a fault detected in the NTC 2 sensor, which is the inlet control thermistor. This thermistor monitors incoming air temperature at the dryer's inlet and feeds that data to the main control board so it can regulate heating cycles accurately. When the control board cannot read a valid signal from NTC 2, it throws the E73 code and may shut down heating to prevent damage or a hazardous condition. The fault can originate from the thermistor itself, the wiring harness connecting it to the board, or the main control board.

The first diagnostic step is to measure the resistance across terminals J4-3 and J4-4 on the wiring connector. At an ambient temperature of 20 to 25 degrees Celsius, the correct resistance range is 49 KΩ to 63.7 KΩ. A reading significantly above this range, or an open circuit (infinite resistance), points to a failed or disconnected thermistor. A reading within spec shifts suspicion toward the wiring harness connections or the main control board itself.

Common causes include a failed thermistor that has drifted out of its operating range, a loose or corroded connector at J4-3 or J4-4, a broken wire in the harness between the thermistor and the board, or a defective main control board that cannot correctly process a good thermistor signal. Carefully inspecting the connector pins for corrosion or backing out before replacing components can save time and money.

Source: manufacturer service documentation.

Common causes of E73

  1. 01

    Failed NTC 2 inlet thermistor

    Part replacement

    The thermistor itself has failed and its resistance has drifted out of the 49 KΩ to 63.7 KΩ range at room temperature, or reads as an open circuit. Confirm with a multimeter across J4-3 and J4-4.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    The connector at J4-3 and J4-4 may have vibrated loose or never fully seated, breaking the signal path. Inspect the connector for proper seating and any backed-out pins.

  3. 03

    Damaged or broken wiring harness

    Part replacement

    A wire in the harness between the thermistor and the main board may be broken or chafed through, causing an open circuit. Visually trace the harness and use a multimeter to check continuity along each conductor.

  4. 04

    Corroded connector terminals

    Wiring / connection

    Moisture or heat exposure can cause oxidation on the J4-3 and J4-4 terminals, increasing contact resistance enough to trigger the fault. Look for discoloration or greenish deposits on the pins and sockets.

  5. 05

    Defective main control board

    Part replacement

    If the thermistor resistance measures correctly within 49 KΩ to 63.7 KΩ and the wiring and connectors check out, the main control board may be failing to interpret the sensor signal properly. This is the least common cause and should be diagnosed last.

See the test procedure for each cause

Frequently asked questions about E73

What does E73 mean on a Electrolux dryer?
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.
How do I fix an E73 error on my Electrolux dryer?
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.
Will resetting my Electrolux dryer clear the E73 code?
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.
Is it safe to use my dryer when the E73 code is active?
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.
How much does it cost to repair an E73 error on an Electrolux dryer?
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.

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