mypros+
Error code reference

Electrolux Washer Error Code EH4

Zero Watt relay alarm

Electrolux codesElectrolux washer codes

Zero Watt relay alarm - Zero Watt relay not working and machine still switched on.

First step from the service manual

Check main board.

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

MyPros+ Max

Get the full diagnostic procedure for EH4.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What EH4 means on a Electrolux washer

The EH4 error code on an Electrolux washer indicates a Zero Watt relay alarm. This fault is triggered when the control system detects that the Zero Watt relay has failed to open as expected, yet the machine remains in a powered-on state. The Zero Watt relay is a power-saving component designed to cut standby current consumption when the washer is not actively running a cycle. When this relay fails to function correctly, the main board registers the fault and generates the EH4 code to alert the technician that the power management circuit is compromised.

The Zero Watt relay is controlled directly by the main control board, which monitors relay state and switching behavior. A failure in this circuit can stem from a relay that is stuck closed, a damaged relay driver circuit on the board, or a wiring issue between the relay and the board. Because the relay remains engaged when it should be open, the washer cannot properly enter its low-power standby state, and the fault is logged.

The primary diagnostic starting point is the main control board itself, as the relay is typically integrated into or directly driven by the board assembly. Technicians should inspect the board for visible damage such as burnt components, failed solder joints, or corrosion near the relay circuit. If the board and relay appear physically intact, checking for correct voltage signals at the relay driver pins can help isolate whether the fault lies in the relay itself or in the board's control logic.

Source: manufacturer service documentation.

Common causes of EH4

  1. 01

    Failed main control board

    Part replacement

    The Zero Watt relay is driven by the main board, and a fault in the relay driver circuit or onboard relay itself is the most likely cause. Inspect the board for burnt traces, damaged components, or failed solder joints near the relay circuit.

  2. 02

    Defective Zero Watt relay

    Part replacement

    If the relay is a discrete component rather than fully integrated into the board, it may have failed in a stuck-closed position. A relay stuck closed will prevent the machine from cutting power to standby circuits as intended.

  3. 03

    Wiring harness fault

    Wiring / connection

    Damaged, corroded, or loose wiring between the main board and the relay circuit can cause incorrect signals and trigger the EH4 alarm. Inspect connectors and wiring for continuity and secure connections.

  4. 04

    Power supply irregularity

    Wiring / connection

    Fluctuations or irregularities in the incoming power supply can cause relay switching errors that the board interprets as a Zero Watt relay failure. Verify that the outlet voltage is stable and within the required range for the appliance.

See the test procedure for each cause

Frequently asked questions about EH4

What does EH4 mean on a Electrolux washer?
The EH4 code indicates a Zero Watt relay alarm on an Electrolux washer. It means the control system has detected that the Zero Watt relay is not functioning correctly, and the machine is remaining powered on when the relay should have opened. This is a power management circuit fault that requires inspection of the main control board and associated relay components.
Can I fix the EH4 error myself?
Some preliminary checks, such as inspecting wiring connections and verifying outlet voltage, can be done by a knowledgeable DIYer. However, if the fault lies within the main control board or the relay driver circuit, repair or replacement of the board is typically required and is best handled by a qualified technician. Working inside the machine involves exposure to line voltage, so safety precautions are essential.
Is it safe to continue using my washer when EH4 is displayed?
It is not recommended to continue running the washer while the EH4 fault is active. A failed Zero Watt relay means the machine is not properly controlling its own power state, which could place additional stress on other electrical components. Discontinue use and have the machine inspected before running further cycles.
Will resetting the washer clear the EH4 error code?
A simple power reset is unlikely to permanently clear the EH4 error, because the fault is tied to a hardware failure in the relay or control board circuit. The code will typically return as soon as the machine attempts to manage its power state again. The underlying component issue must be diagnosed and repaired for the fault to be resolved.
How much does it cost to repair an EH4 error on an Electrolux washer?
Repair costs vary depending on whether the fix requires a new main control board or just a wiring correction. Main control board replacements for Electrolux washers typically range from $150 to $400 or more including parts and labor, while a wiring repair may be considerably less. Getting a diagnostic estimate from a certified technician before committing to repairs is advisable.

Related Electrolux washer codes

All Electrolux washer codes
View all 231 Electrolux washer codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass