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Error code reference

Electrolux Dryer Error Code H3

Power supply amplitude out of range (too LOW voltage).

Electrolux codesElectrolux dryer codes

Power supply amplitude out of range (too LOW voltage).

First step from the service manual

Check for power supply problems (too low voltage) or main board failure.

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

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What H3 means on a Electrolux dryer

The H3 error code on an Electrolux dryer indicates that the control system has detected a power supply amplitude that falls below the acceptable operating range. In practical terms, this means the dryer is receiving AC line voltage that is too low for safe and proper operation. The main control board continuously monitors incoming voltage, and when it senses that the amplitude is insufficient, it triggers H3 to prevent potential damage to the motor, heating element, and electronic components that depend on stable voltage levels.

Low voltage conditions can originate from several points in the electrical supply chain. A weak or failing circuit breaker, a deteriorated wall outlet, loose wiring connections at the terminal block, or broader utility supply issues can all result in reduced voltage reaching the appliance. In some cases, only one leg of the 240V supply may be present due to a tripped breaker half, which delivers roughly 120V to a dryer expecting full dual-leg power. This scenario is particularly common and will reliably trigger the H3 code.

If the incoming voltage checks out within acceptable limits at the terminal block, the main control board itself becomes the primary suspect. A failing board may misread line voltage due to degraded sensing circuitry, producing a false H3 even when supply voltage is adequate. Diagnosis should begin with a verified voltage measurement at the outlet and terminal block before condemning the board.

Source: manufacturer service documentation.

Common causes of H3

  1. 01

    Partially tripped circuit breaker

    Part replacement

    A double-pole breaker that has partially tripped can cut one leg of the 240V supply, delivering only half the required voltage. Check the breaker panel and reset or replace the breaker if necessary.

  2. 02

    Low utility supply voltage

    Wiring / connection

    Voltage sags from the utility grid, especially during peak demand periods, can drop line voltage below the dryer's required operating range. Measure voltage at the outlet with a multimeter to confirm whether this is the source.

  3. 03

    Loose or corroded wiring at the terminal block

    Wiring / connection

    Loose connections at the dryer's power terminal block create resistance that drops effective voltage. Inspect the terminal block for signs of heat damage, corrosion, or loose wires and secure or replace as needed.

  4. 04

    Faulty wall outlet or receptacle

    Part replacement

    A worn or damaged 240V receptacle can fail to deliver full voltage to the dryer's power cord. Testing voltage directly at the outlet with a multimeter will reveal whether the receptacle is the source of the problem.

  5. 05

    Defective main control board

    Part replacement

    If all power supply measurements are within acceptable limits, the main control board may have degraded voltage-sensing circuitry that triggers a false H3 code. Replacing the board is required if the power supply is confirmed to be adequate.

See the test procedure for each cause

Frequently asked questions about H3

What does H3 mean on a Electrolux dryer?
The H3 code means the dryer's control board has detected that the incoming power supply voltage is too low for safe operation. The dryer monitors AC line voltage continuously and will display H3 when that voltage falls below the acceptable range. The issue can stem from the home's electrical supply, wiring, or in some cases, a faulty main control board.
Can I fix the H3 error on my Electrolux dryer myself?
Some causes of H3 are DIY-friendly, such as resetting a tripped circuit breaker or tightening loose connections at the terminal block. However, working on 240V wiring carries serious safety risks, and any work inside the dryer's terminal area should be performed with the appliance fully unplugged. If the issue traces back to home wiring or the receptacle, a licensed electrician should handle those repairs.
Is it safe to keep using my dryer when H3 is displayed?
No, you should not continue operating the dryer while H3 is active. Insufficient voltage can cause the motor and heating components to draw excessive current while attempting to compensate, which can damage internal components or create an overheating risk. Resolve the power supply issue before resuming use.
Will resetting the dryer clear the H3 error code?
A power reset may temporarily clear the H3 code, but the error will return if the underlying voltage problem has not been corrected. Resetting is useful as a first step after you have addressed the suspected cause, such as resetting a tripped breaker, but it is not a fix on its own. The control board will re-detect the low voltage condition and display H3 again.
How much does it cost to repair an Electrolux dryer showing H3?
Repair costs vary depending on the root cause. Resetting a breaker costs nothing, while replacing a worn receptacle or breaker through an electrician might run anywhere from $75 to $250 or more depending on local labor rates. If the main control board is at fault, the board itself plus labor can bring the total repair cost to a range of $150 to $400 or higher.

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