After hose or plumbing work, 4C2 needs a hot/cold supply-identification check. Hose color alone is not proof of the actual supply. Have an installer verify uncertain connections without disconnecting a hot pressurized line or using skin temperature as a test.
Selected Samsung washers code family. Confirm the exact model and displayed characters; similar codes on other appliances are not interchangeable.
Wait for motion to stop and the door or lid to unlock. Water may be hot. Isolate power and follow the exact manual before any user filter maintenance. Never open a filter against a full drum, force a lock or bypass an interlock.
Trace the supply and the reported state
Supply labels, hose colors and actual household water temperature are three different kinds of evidence. Do not assume a blue hose guarantees a cold supply if plumbing was changed. Have an installer confirm the route when it is uncertain. If the supplies are professionally verified and the code remains, record that finding so appliance service does not repeat an unresolved installation assumption.
| Observed state | Interpretation / next step |
|---|---|
| What the code narrows down | After hose or plumbing work, 4C2 needs a hot/cold supply-identification check. Hose color alone is not proof of the actual supply. Have an installer verify uncertain connections without disconnecting a hot pressurized line or using skin temperature as a test. |
| What it does not prove | A display code is not a verified failed-part or compatibility diagnosis. |
Code-specific checks
Trace labels visually
With the appliance stopped, compare visible hot/cold inlet labels and hose routing to the model manual. Color alone is not proof that a household valve is correctly connected.
Use an installer for correction
If lines appear crossed or identification is uncertain, turn the washer off and ask the installer or plumber to confirm and correct them. Do not disconnect a hot pressurized line.
Confirm the result
After professional correction, monitor a normal cycle. If the same code returns despite confirmed supplies, give service the installation findings and exact model.
If the warning returns
Crossed or uncertain supplies → installer/plumber
Supplies verified correct, code returns → appliance support
Leak or scalding concern → stop.
When to stop and get help
Only carry out maintenance permitted in your model’s manual. For service, note the full model number and suffix, displayed code, selected cycle and what happened during the checks. Leave internal wiring, gas components, pumps and safety devices to a qualified professional. A symptom alone does not identify a failed part.
Should I replace a temperature sensor immediately?
No. Confirm the supply arrangement first and use model-specific diagnosis if the error persists.
Sources & references
- Code meaning and permitted user checks. Linked manufacturer code/support section
Based on publicly available manuals, manufacturer support and the references listed here. We have not inspected or tested your appliance. Follow the instructions for your exact model; a guide cannot replace an in-person diagnosis.