Samsung Washer code **A4** is associated with **factory test mode is active**. The display identifies the system or condition the control detected, but it does not by itself prove which individual part should be replaced. Samsung uses overlapping code conventions across model years and regions. This page keeps the appliance context attached to the code so a same-looking string from another product family is not misapplied. The recorded display form is **A4**. Search normalization stores it as **A4** while preserving the characters a homeowner actually sees.
Reviewed by Ethan Mercer · Last reviewed August 17, 2026
Written by
Ethan Mercer Appliance Repair Content SpecialistPublished August 17, 2026Updated August 22, 2026Technically reviewed August 17, 2026
Content status:
Verified
Error codeA4
ApplianceWasher
Quick answer
Factory test mode is active.
Model compatibility: Samsung can reuse or reformat codes across series and model years, so A4 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Samsung Washer code **A4** is associated with **factory test mode is active**. The display identifies the system or condition the control detected, but it does not by itself prove which individual part should be replaced. Samsung uses overlapping code conventions across model years and regions. This page keeps the appliance context attached to the code so a same-looking string from another product family is not misapplied. The recorded display form is **A4**. Search normalization stores it as **A4** while preserving the characters a homeowner actually sees.
Signs
Symptoms you may notice
When the A4 condition is present, the display appears while the appliance is otherwise able to respond normally.
A4 can be accompanied by this pattern: the message can be tied to a mode, test, reminder, setup state, or protective condition rather than a failed part.
When the A4 condition is present, normal operation may resume after the documented mode or condition is cleared.
When the A4 condition is present, a4 appears on the display while the appliance reports: Factory test mode is active.
Why it happens
Possible causes
varies by model — official regional/current support — Factory test mode is active
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
A safe owner-level check is to confirm the exact display characters and appliance model before treating the message as an issue.
For A4, start by doing this: check the user-facing setting, mode, door, filter, container, or setup condition named by Samsung for this display.
A safe owner-level check is to use the model-specific manual to clear the status; avoid repeated resets if the message reappears unexpectedly.
A safe owner-level check is to record the code and the cycle stage where it appears.
For A4, start by doing this: verify owner-accessible water supply, drain hose/filter, load balance, door, detergent, or power only when relevant.
For A4, start by doing this: power-cycle once only where Samsung's guidance recommends it; if the same code reappears, move to model-specific diagnosis.
Important safety warning. When working around a washing machine that shows A4, keep the checks external and non-invasive. Disconnect power and stop use for active leakage near electrical parts, smoke, burning smell, or repeated breaker trips.
Get help
When to request repair service
Once A4 has returned after the safe checks, Service is not automatically required. Request diagnosis only if the status cannot be cleared as designed or normal operation does not resume. Preserve any accompanying noise, water level, temperature, or operating-stage details for the technician.
Book your repair
Seeing this code on your Samsung appliance?
Book a specialist visit for a clear estimate and approval before any repair.
Resetting can clear a temporary state, not a persistent issue. If **A4** comes back, preserve the code and move to the safe checks or model-specific service path.
The display can be normal in the documented context. If **A4** appears unexpectedly, cannot be cleared, or prevents normal operation, then the issue deserves diagnosis.
Not automatically. Samsung error codes are diagnostic indicators, not part numbers. Confirm the circuit around **A4** before replacing anything.
The same-looking code can be reused on another Samsung appliance family or reformatted by region/model year. Match the appliance type and exact model before applying a meaning. This page therefore keeps **Washer A4** separate from same-looking codes used by other Samsung appliance families.
