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Error code reference

Electrolux Dryer Error Code 0xB4

Zero Watt Relay Error

Electrolux codesElectrolux dryer codes

Zero Watt Relay Error – Line connections in home faulty, wiring or Main Board defective.

First step from the service manual

Check wiring at terminal block for L1-N-L2 wired correctly.

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

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What 0xB4 means on a Electrolux dryer

The 0xB4 error code on an Electrolux dryer indicates a Zero Watt Relay Error. This fault is tied to the dryer's power monitoring circuit, which tracks the electrical load across the relay responsible for controlling power delivery to the heating element or motor circuit. When the control board detects an unexpected zero-watt condition through this relay, it flags the fault and halts operation to prevent potential damage or unsafe running conditions. The relay itself is integrated into or directly controlled by the main control board.

The most common source of this error is an issue with the home's electrical supply connections at the terminal block. Electrolux dryers require correct L1, Neutral, and L2 wiring to operate safely and to allow the control board to monitor power accurately. If any of these legs are miswired, reversed, or making poor contact, the board cannot detect the expected load through the relay circuit and throws this code. Loose terminal connections, corroded lugs, or a missing neutral are all conditions that can produce this fault.

If the terminal block wiring checks out as correct and secure, the fault source shifts to the wiring harness between the terminal block and the main board, or to the main board itself. A defective relay on the main board, a burned trace, or a failed relay driver circuit can all cause the board to report a zero-watt condition even when line voltage is present. In that scenario, the main control board typically requires replacement to resolve the error.

Source: manufacturer service documentation.

Common causes of 0xB4

  1. 01

    Incorrect terminal block wiring (L1, N, L2)

    Wiring / connection

    If the power supply lines at the terminal block are miswired or connected to the wrong terminals, the control board cannot detect the expected load through its relay circuit. Visually inspect and verify that L1, Neutral, and L2 are connected to their designated terminal positions.

  2. 02

    Loose or corroded terminal block connections

    Wiring / connection

    A loose lug or corroded terminal can interrupt the electrical path enough to cause a zero-watt reading even if the wires are connected to the correct positions. Check each terminal for tightness and signs of arcing, overheating, or corrosion.

  3. 03

    Damaged wiring harness between terminal block and main board

    Part replacement

    A broken wire, pinched conductor, or failed connector in the harness running from the terminal block to the control board can prevent proper voltage signals from reaching the board. Inspect the harness for visible damage, continuity breaks, or loose connectors.

  4. 04

    Defective main control board relay

    Part replacement

    If the zero-watt relay on the main board has failed internally, the board will report this error even with correct line voltage present. This is identified after ruling out all wiring issues and typically requires main board replacement.

  5. 05

    Failed or defective main control board

    Part replacement

    Beyond a single relay failure, broader main board defects including burned traces or failed relay driver circuits can produce the 0xB4 code. Board replacement is the corrective action when all upstream wiring has been confirmed good.

See the test procedure for each cause

Frequently asked questions about 0xB4

What does 0xB4 mean on a Electrolux dryer?
The 0xB4 code indicates a Zero Watt Relay Error, meaning the dryer's control board detected an unexpected zero-watt condition through its power relay circuit. This points to a problem with the home's line connections at the terminal block, the wiring harness, or the main control board itself. The dryer will not operate normally until the fault is diagnosed and corrected.
How do I fix the 0xB4 error on my Electrolux dryer?
Start by inspecting the terminal block inside the dryer where the power cord connects, confirming that L1, Neutral, and L2 are wired to the correct terminals and that all connections are tight and free of corrosion. If the wiring is correct and secure, check the harness between the terminal block and the main board for continuity and damage. If both checks pass, the main control board is likely defective and will need to be replaced.
Is it safe to use my Electrolux dryer while the 0xB4 error is active?
No, you should not attempt to operate the dryer with this error present. A Zero Watt Relay Error can indicate a wiring problem that poses a risk of arcing, overheating, or component damage. Disconnect the dryer from power and have the wiring and control board inspected before resuming use.
Will resetting my Electrolux dryer clear the 0xB4 error?
A power reset may temporarily clear the code from the display, but the error will return if the underlying cause has not been corrected. The fault condition involving the relay circuit or wiring must be physically resolved for the code to stay cleared. A reset alone is not a repair.
How much does it cost to repair an Electrolux dryer with a 0xB4 error?
If the fix is simply tightening or correcting the terminal block wiring, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the main control board requires replacement, parts and labor combined generally fall between $200 and $400 depending on the specific model and local labor rates. Getting a diagnostic quote before authorizing board replacement is advisable.

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