Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- Visible electrical damage
- Repeated resets or breaker trips
- Control-board access is required
Likely causes
- Internal modules lost communication
- Connector or wiring is damaged
- Power interruption affected startup
- A control board or inverter failed
Quick checks, in order
Power down completely
Disconnect power for several minutes, then restore once.
Note recent outages
Surges or unstable power can trigger control faults.
Check only external connections
Do not open control panels.
Arrange service if it returns
Repeated control faults require model-specific diagnosis.
What happens when SF appears?
Monitor and check power stability.
A module, harness, or power supply may be faulty.
Power quality or control supply may be involved.
Stop and get qualified help when
- Visible electrical damage
- Repeated resets or breaker trips
- Control-board access is required
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does SF mean on a Samsung washer?
On many model families, SF indicates that the main control board reported an error. Confirm the exact model and region because the same display can be used differently.
Can I clear SF by unplugging the washer?
A short power reset may clear a temporary state, but it will not fix a blocked hose, leak, failed sensor, motor, heater, or wiring fault. Stop if the code returns.
Should I replace a part based only on the code?
No. A code identifies a system or condition, not always the failed component. Complete safe external checks and use the model-specific manual or qualified service.