Samsung · Dishwasher Moderate

3E — Hot water supply too hot

Incoming water temperature is above the safe limit (above ~176°F / 80°C). The control aborts to protect components and plastics.

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

How to fix it

  1. Lower the household water heater setpoint to 120°F (49°C) — the recommended setting for both safety and dishwasher specs.
  2. Run a cold-water rinse or wait an hour for plumbing to cool, then restart the dishwasher.
  3. If you have an instant recirculation loop, verify the supply line to the dishwasher is correct.
  4. If the code returns with water under 140°F at the tap, replace the inlet temperature sensor.

Why it happens

Typical signs: 3E on display · Cycle aborts early · Steam coming from tub · Detergent dispenser melts (in extreme cases)

  • Water heater set too high Home water heater above 140°F sends water hot enough to trip this fault.
  • Dishwasher plumbed to wrong line Connected to a recirculating loop running hotter than normal.
  • Failed inlet thermistor Temperature sensor reads high incorrectly.

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 dishwasher temperature sensor Common replacement
    Amazon →

More Samsung dishwasher codes

1C 1C — Low water level / fails to start 1E 1E / IE — Filter clogged / heater fault 3C 3C Error — Wash Pump Failure 4C 4C / 4E — Water Supply Error 4C5 4C5 / 4E5 — Fill timeout with dry tub 5C 5C / 5E — Drain Error

All Samsung codes → All dishwasher codes →

Frequently asked questions

What does the 3E code mean on a Samsung dishwasher?

Incoming water temperature is above the safe limit (above ~176°F / 80°C). The control aborts to protect components and plastics.

What causes the 3E code on a Samsung dishwasher?

Water heater set too high: Home water heater above 140°F sends water hot enough to trip this fault. Dishwasher plumbed to wrong line: Connected to a recirculating loop running hotter than normal. Failed inlet thermistor: Temperature sensor reads high incorrectly.

Is it safe to keep using a Samsung dishwasher with a 3E error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix 3E on a Samsung dishwasher?

Lower the household water heater setpoint to 120°F (49°C) — the recommended setting for both safety and dishwasher specs. Run a cold-water rinse or wait an hour for plumbing to cool, then restart the dishwasher. If you have an instant recirculation loop, verify the supply line to the dishwasher is correct.

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.