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Error code reference

Electrolux Dryer Error Code EH4

Zero Watt relay alarm

Electrolux codesElectrolux dryer codes

Zero Watt relay alarm — tumble dryer works properly but zero Watt circuit is never activated; main board faulty.

First step from the service manual

Replace main board.

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

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What EH4 means on a Electrolux dryer

The EH4 error code on an Electrolux dryer indicates a Zero Watt relay alarm. In this fault condition, the dryer continues to operate normally in terms of tumbling and heating, but the zero Watt circuit is never activated by the main control board. The zero Watt circuit is a power-saving feature designed to cut standby power consumption to near zero when the dryer is not in use. When the board fails to trigger this relay, the machine flags the fault even though drying performance is not immediately impaired.

The root cause of EH4 is a faulty main control board. The relay responsible for engaging the zero Watt circuit is either defective on the board itself or the board's control logic is failing to send the appropriate signal to that relay. Because the dryer's primary functions, such as motor control, heating, and drum rotation, remain operational, the fault is isolated to this specific circuit on the board rather than a broader system failure.

Because this error points directly to the main board as the failed component, diagnostic steps focus on board replacement rather than wiring or sensor checks. There are no external sensors, thermistors, or wiring harnesses associated specifically with the zero Watt relay that would typically require testing first. If EH4 appears, the main control board should be replaced to restore proper function of the zero Watt circuit and clear the alarm.

Source: manufacturer service documentation.

Common causes of EH4

  1. 01

    Failed main control board

    Part replacement

    The main board contains the relay and control logic for the zero Watt circuit. When the board fails internally, it cannot activate this relay, triggering the EH4 alarm. Replacement of the main board is the primary and indicated repair.

  2. 02

    Defective zero Watt relay on the board

    Part replacement

    The specific relay responsible for the zero Watt function may have failed while the rest of the board remains functional. This is still a board-level failure and requires main board replacement rather than individual relay repair.

  3. 03

    Board control logic failure

    Part replacement

    A failure in the microcontroller or firmware logic on the main board can prevent the zero Watt relay signal from being generated, even if the relay itself is intact. This type of failure is not serviceable at the component level and requires full board replacement.

See the test procedure for each cause

Frequently asked questions about EH4

What does EH4 mean on a Electrolux dryer?
EH4 is a Zero Watt relay alarm indicating that the dryer's power-saving standby circuit is not being activated by the main control board. The dryer will continue to operate and dry clothes normally, but the zero Watt function is non-functional. The fault is attributed directly to a faulty main control board.
Can I fix the EH4 error myself?
The indicated repair for EH4 is replacement of the main control board, which is an intermediate-level repair. A knowledgeable DIYer comfortable working with appliance electronics and disconnecting power safely can perform this repair. However, if you are not confident working inside the appliance, a qualified technician is recommended.
Is it safe to keep using my Electrolux dryer with an EH4 error?
The dryer's core drying functions remain operational during an EH4 fault, so the appliance will continue to tumble and heat normally. However, the zero Watt power-saving circuit is not functioning, which means the dryer may draw more standby power than intended. It is advisable to address the board replacement in a timely manner rather than leaving the fault unresolved indefinitely.
Will resetting the dryer clear the EH4 error code?
A power reset may temporarily clear the error display, but the EH4 fault will return because the underlying cause is a hardware failure in the main control board. The zero Watt relay circuit will continue to fail to activate until the board is replaced, so resetting is not a lasting solution.
How much does it cost to fix an EH4 error on an Electrolux dryer?
Repair costs depend on whether you replace the main board yourself or hire a technician. The main control board part alone typically falls in the range of $100 to $250 depending on the specific model. If you use a professional repair service, expect total costs including labor to range from $200 to $400 or more.

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