AB
Samsung Washing Machine
Severity: MinorWhat Does This Error Mean?
The AB error on a Samsung washer indicates an auto-balance system fault or an air bubble detection issue. Samsung's auto-balance system uses sensors to detect and correct load imbalances during the spin cycle. AB appears when the auto-balance system cannot correct the imbalance within the allowed number of attempts, or when its sensor detects an internal air pressure abnormality. This is often resolved by redistributing the laundry — it is not usually a sign of a mechanical failure.
Affected Models
- Samsung front-load washers with auto-balance and vibration reduction technology
- WF45R6100AW
- WF50R8500AV
- WF45T6000AW
- VRT Plus series Samsung washers with vibration reduction technology
Common Causes
- Load is heavily unbalanced — clothes are bunched on one side of the drum and the auto-balance system cannot correct it
- Washing a single large item such as a comforter or sleeping bag with nothing to counterbalance it
- Auto-balance sensor has a fault or debris is affecting the sensor reading inside the washer
- Washer is not level — the machine tilts during spin and the auto-balance system cannot compensate
- Shock absorbers are worn and the drum moves excessively, overwhelming the auto-balance mechanism
How to Fix It
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Pause the cycle and open the washer door. Rearrange the laundry by hand, spreading items evenly around the drum. Untangle any large items that have wrapped together.
The AB error is most common with large, heavy, or bulky items. Adding a few smaller items (like towels) alongside a comforter helps the drum balance.
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Reduce the load size if the drum is overfilled. Samsung washers work best when the drum is filled to no more than about three-quarters of its capacity. Overfilling prevents proper tumbling and balancing.
An overloaded washer also causes poor cleaning results — a smaller load is better for the machine and your laundry.
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Check that the washer is level. Place a spirit level on top of the machine front-to-back and side-to-side. Adjust the leveling feet until all four corners are firmly on the floor and the machine does not rock.
Even a slight tilt causes the drum contents to shift during spin, making balance issues worse.
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Restart the cycle. Select the same cycle and press Start. The washer will attempt another auto-balance correction before entering the spin phase.
If the machine completes the cycle without returning AB after load redistribution, the problem was simply an unbalanced load.
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If AB appears on every cycle regardless of load size or distribution, the auto-balance sensor or the shock absorbers inside the machine need inspection. Contact Samsung support or a technician.
Worn shock absorbers allow excessive drum movement. When the drum moves more than the sensor's correction range, AB triggers on every load.
When to Call a Professional
If AB appears consistently on every cycle even with properly distributed loads, the auto-balance sensor or shock absorbers may need inspection. A technician can assess the internal components and advise on repair. Shock absorber replacement typically costs $120 to $250.
Frequently Asked Questions
Is the AB error the same as the UB error on Samsung washers?
They are related — both relate to balance issues during spinning. UB is the standard unbalanced load code, while AB specifically indicates the auto-balance correction system was involved. The fix is the same in most cases: redistribute the load and restart.
Can I prevent AB errors from happening?
Yes — sort your laundry before washing and mix large items with smaller ones so the drum can balance itself. Avoid washing single bulky items alone. Also run the Tub Clean cycle regularly — detergent residue buildup on the drum surface can affect how clothes tumble and balance.
Does AB damage the washer if it happens frequently?
Frequent imbalance events cause the drum and shock absorbers to work harder than normal. Over time this can accelerate wear on the suspension components. Resolving balance issues promptly protects the machine's long-term reliability.