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Error code reference

Electrolux Dryer Error Code B3

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 B3 means on a Electrolux dryer

The B3 error code on an Electrolux dryer indicates that the power supply amplitude has fallen outside the acceptable operating range, specifically on the low side. The control board continuously monitors incoming line voltage and triggers this fault when the detected voltage drops below the threshold required for safe, reliable dryer operation. This is a protective fault designed to prevent the dryer from running under conditions that could damage components or produce inadequate heating performance.

The two primary systems involved are the external power supply circuit and the main control board itself. On a standard 240V electric dryer, both legs of the supply voltage must be present and within spec. A dropped leg, a weak connection at the terminal block, a failing outlet, or household voltage sag can all cause the control board to register amplitude that is too low. The main board contains the voltage-sensing circuitry, so a fault within the board itself can also produce a false B3 reading even when supply voltage is actually adequate.

Diagnosis should begin at the power source. Verify line voltage at the outlet and at the dryer terminal block using a multimeter under load conditions. Loose or corroded connections at the outlet, the terminal block, or the junction inside the dryer are common culprits. If supply voltage measures correctly throughout, the main control board becomes the primary suspect and should be evaluated for internal component failure.

Source: manufacturer service documentation.

Common causes of B3

  1. 01

    Low or dropped supply voltage at the outlet

    Wiring / connection

    The wall outlet or circuit breaker may be delivering insufficient voltage, possibly due to a partially tripped breaker or a weak leg in the electrical supply. Test voltage at the outlet under load with a multimeter to confirm both legs are within the expected range.

  2. 02

    Loose or corroded connections at the terminal block

    Wiring / connection

    Loose wiring at the dryer's terminal block can cause voltage drop that the control board interprets as a low-amplitude supply fault. Inspect all terminal block connections for tightness, discoloration, or corrosion and resecure or clean as needed.

  3. 03

    Failing or weak electrical outlet or receptacle

    Part replacement

    A worn 240V receptacle can produce intermittent or degraded contact, resulting in voltage that dips below acceptable levels. Replacing the outlet may resolve the fault if the receptacle shows signs of heat damage, arcing, or loose contact tension.

  4. 04

    Household wiring or circuit issue

    Part replacement

    Problems upstream in the home's electrical panel, such as a failing breaker or undersized wiring, can cause chronically low voltage to the dryer circuit. An electrician should evaluate the circuit if outlet and terminal block connections check out correctly.

  5. 05

    Main control board failure

    Part replacement

    If supply voltage at the terminal block is confirmed to be within the proper range, the voltage-sensing circuitry on the main control board itself may have failed, causing it to incorrectly report a low-voltage condition. Replacing the main board is the corrective action in this scenario.

See the test procedure for each cause

Frequently asked questions about B3

What does B3 mean on a Electrolux dryer?
The B3 code on an Electrolux dryer means the control board has detected that the incoming power supply voltage is too low, falling outside the acceptable amplitude range. The dryer displays this fault to prevent operation under conditions that could damage components or cause poor performance. The fault points to either an external power supply problem or a failure of the main control board's voltage-sensing circuitry.
Will resetting the dryer clear the B3 error code?
Resetting the dryer by disconnecting power for a few minutes may temporarily clear the B3 code, but the fault will return if the underlying cause is not corrected. If the low-voltage condition is intermittent, such as from a loose connection or fluctuating supply, the code may reappear with the next cycle. A permanent fix requires identifying and correcting the root cause in the power supply circuit or the main board.
How do I fix a B3 error code on my Electrolux dryer?
Start by checking the voltage at the wall outlet and at the dryer's terminal block using a multimeter, confirming both legs of the 240V supply are present and within range. Inspect the terminal block connections inside the dryer for looseness or corrosion and tighten any that need attention. If supply voltage is correct throughout, the main control board is likely the faulty component and will need to be replaced.
Is it safe to use my Electrolux dryer when it shows a B3 error?
You should not attempt to continue operating the dryer while the B3 code is active. Running an appliance on insufficient voltage can overstress electrical components, cause overheating, and lead to further damage. Address the power supply issue or board fault before resuming use.
How much does it cost to repair a B3 error code on an Electrolux dryer?
Repair costs vary depending on the root cause. If the fix involves tightening connections or replacing the wall outlet, costs are typically in the range of $50 to $150 including a service call. If a main control board replacement is needed, parts and labor combined can range from $200 to $450 or more depending on the specific model and local labor rates. Having an electrician evaluate the home circuit, if needed, may add additional cost.

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