Step-by-Step DIY Fix Guide
- SAFETY: Disconnect power at the circuit breaker before checking any water connections.
- Check your home water heater thermostat setting — the recommended setting for dishwasher compatibility is 120°F (49°C).
- Confirm the dishwasher supply line is connected to the hot water supply, not a recirculating line that may be at extreme temperature.
- Run the kitchen faucet for 60 seconds to flush any very hot water from the supply line before the next dishwasher cycle.
- Restore power and run a rinse cycle to confirm 3E clears.
- If 3E returns on normal household water temperature, the thermistor (water temperature sensor) is faulty.
If it's still not filling correctly
- If normal household water flow looks good but the code returns, the inlet-valve or fill-sensing path becomes more likely.
- If the door closes normally but the warning keeps returning, the latch or switch path becomes more likely than a simple alignment issue.
- If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.
What This Error Means
Error 3E on your Samsung dishwasher means: The incoming water supply to the dishwasher exceeds the safe operating temperature limit (above 176°F / 80°C). Samsung dishwashers heat their own water and are designed for a cold or warm supply — not a supply that is already at high temperature. The dishwasher's self-diagnostic system has flagged this condition and may have paused the current cycle.
The most frequent cause is hot water supply line connected incorrectly — dishwasher receiving water at too high a temperature. Work through the causes and steps below before calling a technician.
Many cases of 3E can be partially resolved by the homeowner. Complete all DIY steps before contacting a technician.
The most commonly overlooked cause of water supply errors is a supply shutoff valve that is only partially open. The valve under the sink must be fully open (turned counter-clockwise until it stops) — a valve that is 80% open may work under low demand but fail when the dishwasher requires full fill pressure.
Most Likely Cause by Symptom
The Samsung dishwasher may stop, pause, or refuse to complete the cycle normally.
Likely cause: Hot water supply line connected incorrectly — dishwasher receiving water at too high a temperature
Check first: SAFETY: Disconnect power at the circuit breaker before checking any water connections.
Common Causes
- Hot water supply line connected incorrectly — dishwasher receiving water at too high a temperature
- Home water heater set above 140°F and supply line is very short, delivering near-boiling water
- Thermistor (temperature sensor) fault — sensor is misreading normal supply temperature as too high
- Valve or plumbing issue delivering hot water before cold on initial fill
What Not to Do
- Do not ignore 3E — operating with water above 176°F can damage the dishwasher tub, seals, and internal components
Model and Display Variation Notes
Model-family notes
- Samsung dishwasher display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Thermistor/temperature sensor ($20–$50)
- Water inlet valve if valve is delivering water at incorrect temperature ($30–$70)
Manual and model check
Check your exact model and manual before ordering any Samsung dishwasher parts.
Service option
Samsung service visit if the warning returns after the basic checks are complete.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
3E persists after confirming water heater is set to 120°F or below
- 3E appears immediately on every cycle with no relation to water supply temperature
How to Prevent It Recurring
- Set your home water heater to 120°F — this is the recommended temperature for dishwashers and reduces scalding risk
Related Error Codes
HE
Samsung dishwasher error HE usually means the machine is not heating the wash water correctly.
HC
The dishwasher has detected that the water temperature is too high for the current cycle on rotary spray arm models. The heating element or water supply is delivering water above safe operating limits, and the cycle has been interrupted to prevent damage.
1E
On WaterWall models, 1E indicates the filter is clogged and restricting water flow. On rotary spray arm models, 1E indicates the water temperature has risen above safe operating limits or the high-temperature heater is faulting.
Extra notes
- This page is based on Samsung support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-08
Based on: Based on Samsung support material and edited into consumer-safe guidance for the exact code family on this page.
View Samsung US Official Support
Model coverage note: Samsung dishwasher code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.