Samsung · Washer Moderate

4C2 — Hot water connected to cold inlet

The washer detected hot water flowing through the cold-water inlet (or the cold supply is too hot). Samsung washers monitor inlet temperature and throw 4C2 when cold-line water exceeds about 122F (50C).

Keep using it?
Yes, with caution
DIY difficulty
Easy
Verified against
samsung.com ↗

How to fix it

  1. Pause the cycle and shut off both supply valves.
  2. Check the hose labels: blue band/hose = cold (top inlet on most models marked C), red = hot.
  3. Swap hoses if they are reversed and restart a cold cycle.
  4. If hoses are correct, lower the home water heater to ~120F and retest.
  5. Run a Rinse+Spin cold-only cycle to confirm clearance.
  6. If the code returns, replace the cold inlet valve assembly (contains the thermistor).

Why it happens

Typical signs: Cycle pauses or won't start · 4C2 appears soon after water fills · Wash water seems too warm

  • Inlet hoses swapped Hot supply hose connected to the cold inlet on the back of the washer.
  • House water heater set too high Cross-feed through a single-handle mixing valve elsewhere can heat the cold line briefly.
  • Failed inlet thermistor Defective temperature sensor on the inlet valve falsely reports hot water.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Samsung washer cold water inlet valve Common replacement
    Amazon →

More Samsung washer codes

3C 3C / 3E — Motor Fault 4C 4C / 4E — Water Supply Error 4E 4E — Water supply error (older code, same as 4C) 5C 5C / 5E / SC — Will Not Drain 5E 5E — Drain error (older code, same as 5C) 8C 8C / 8E — Vibration (MEMS) Sensor Fault

All Samsung codes → All washer codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: samsung.com.