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Error code reference

Electrolux Dryer Error Code 0x5B

FCV Under Voltage Failure

Electrolux codesElectrolux dryer codes

FCV Under Voltage Failure – Power supply problem or main board defective.

First step from the service manual

Verify the power supply is per product specification (208/240 VAC).

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

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What 0x5B means on a Electrolux dryer

Error code 0x5B on an Electrolux dryer indicates an FCV (Fan Control Voltage) Under Voltage Failure. This fault is triggered when the control system detects that the voltage supplied to the fan control circuit falls below the expected operating threshold. The dryer requires a stable 208/240 VAC supply to power its components correctly, and when the incoming voltage is insufficient or unstable, the main control board logs this fault and may shut down operation to prevent damage.

The two primary sources of this fault are a deficient power supply and a defective main control board. On the power supply side, issues can include a tripped or weak circuit breaker, a faulty outlet, loose or corroded wiring connections at the terminal block, or a household electrical supply that is not delivering the correct dual-leg voltage. In a 240 VAC configuration, losing one leg of power will drop the supply to approximately 120 VAC, which will reliably trigger this under-voltage condition.

If the incoming power supply is confirmed to be within specification at 208/240 VAC, the fault points toward the main control board itself. A failing board may misread or fail to regulate the voltage delivered to the fan control circuit, producing a false or genuine under-voltage condition internally. In either case, the diagnostic process should begin with a direct voltage measurement at the dryer's power supply connection before moving to component-level board testing or replacement.

Source: manufacturer service documentation.

Common causes of 0x5B

  1. 01

    Incorrect or low supply voltage

    Wiring / connection

    The dryer requires 208/240 VAC at the wall outlet. A tripped breaker, weak breaker, or a wiring issue dropping one leg of power can reduce voltage significantly and trigger this fault. Measure voltage at the outlet or terminal block to confirm both legs are present and correct.

  2. 02

    Loose or corroded wiring at the terminal block

    Wiring / connection

    Poor connections at the dryer's power terminal block can cause intermittent or sustained voltage drops. Inspect all terminal block connections for burn marks, corrosion, or loose fasteners.

  3. 03

    Faulty or weak circuit breaker

    Part replacement

    A double-pole breaker that has partially failed may pass current on only one leg, cutting the effective supply voltage in half. If voltage at the outlet is low or unbalanced, the breaker should be tested or replaced by a qualified electrician.

  4. 04

    Defective main control board

    Part replacement

    If the power supply measures correctly at 208/240 VAC, the main control board may be failing to regulate or accurately detect voltage within the fan control circuit. A defective board will need to be replaced to resolve the fault.

  5. 05

    Damaged power cord

    Part replacement

    A worn or damaged power cord can cause resistance in the supply lines, resulting in a voltage drop before power even reaches the terminal block. Inspect the cord for signs of damage, heat stress, or fraying.

See the test procedure for each cause

Frequently asked questions about 0x5B

What does 0x5B mean on a Electrolux dryer?
Error code 0x5B indicates an FCV Under Voltage Failure, meaning the dryer's control system has detected that the voltage in the fan control circuit is below the required level. This is caused either by an insufficient power supply reaching the dryer or by a defective main control board. The dryer will typically stop operating until the fault is diagnosed and corrected.
How do I fix error code 0x5B on my Electrolux dryer?
Start by verifying that the dryer's power supply measures 208/240 VAC at the wall outlet or terminal block. Check for a tripped circuit breaker, loose terminal block connections, or a damaged power cord. If the supply voltage is correct and stable, the main control board is the likely cause and should be inspected or replaced by a qualified technician.
Is it safe to keep using my Electrolux dryer when error 0x5B appears?
You should not continue using the dryer while this fault is active. An under-voltage condition can indicate serious wiring problems or a failing electrical component, both of which can pose fire or electrical hazards. Stop using the dryer and resolve the underlying cause before resuming operation.
Will resetting my Electrolux dryer clear the 0x5B error code?
A reset may temporarily clear the code, but if the underlying cause has not been fixed, the fault will return. A power supply problem or defective main control board will continue to trigger 0x5B until the root cause is properly diagnosed and repaired. Always address the source of the fault rather than relying on resets.
How much does it cost to repair an Electrolux dryer showing error code 0x5B?
Repair costs depend on the cause. If the issue is a tripped breaker or a loose connection, there may be little to no cost involved. A replacement circuit breaker typically runs in the range of $10 to $50 for parts, while a new main control board for an Electrolux dryer can range from $100 to $300 or more for the part alone, plus labor if a technician is performing the repair.

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