Samsung Dishwasher HE: Heating Element Not Reaching Target Temperature

Error HE means the wash water did not reach the target temperature within the board's heating timeout. Samsung dishwashers heat water to 130-150F during normal cycles and up to 160F during Sanitize. The control board monitors temperature via the NTC thermistor (code tE monitors the sensor itself) — HE triggers when the board supplies power to the heater element but the thermistor does not report rising temperature within the expected timeframe (typically 10-15 minutes).

HE is different from tE. The tE code means the temperature sensor is electrically faulty (open, shorted, or out-of-range reading). HE means the sensor reads correctly but the water is not getting hot — the problem is in the heating circuit, not the sensing circuit.

How Samsung Dishwashers Heat Water

Samsung uses a concealed heating element embedded in the sump assembly beneath the tub floor (DD81-01950A). Unlike exposed calrod-style elements in older dishwashers, this element is not visible inside the tub. The element operates on 120VAC through a relay on the main control board. During the heating phase, the relay closes, sending power to the element, and the board monitors the thermistor every 2 seconds to track temperature rise.

The target temperature rise rate is approximately 1-2 degrees F per minute. If the board detects less than 5 degrees of change over 5 minutes of continuous heater operation, it flags HE. This means the element may be partially functional — heating slowly but not fast enough to pass the board's rate-of-change check.

Root Cause Diagnosis

Heating Element Burnout (55% of HE Cases)

The concealed element (DD81-01950A) has a nichrome wire coiled inside a sealed sheath. The wire breaks from thermal fatigue — thousands of heat/cool cycles cause the wire to expand and contract until it fractures at a stress point.

Symptoms that preceded HE: Dishes not drying well (weeks before HE), Sanitize light not illuminating (indicates target temperature was not reached), water feeling lukewarm when you open the door mid-cycle.

Test: Power off at breaker. Access the element connections from below (remove kick plate) or behind (pull the unit forward). The element has 2 terminals. Disconnect the wire connectors. Measure resistance: 12-20 ohms is normal for Samsung dishwasher heating elements. Infinite = open circuit (element burned out). Also check element-to-ground: measure between either terminal and the metal element housing — must read infinite. Any ground fault means element insulation has broken down.

Part: DD81-01950A heating element assembly — $80-$130.

Board Heater Relay Failure (25%)

The relay on the main board (DE92-04198A) that switches 120VAC to the heater element fails — contacts corrode, the relay coil opens, or the MOSFET driving the relay burns out. The element is healthy but receives no power.

Test: Reconnect the element. Restore power. Start a Sanitize cycle. During the heating phase (after fill, before wash motor starts), measure voltage at the element terminals — should see 120VAC. Zero voltage with a good element = relay/board failure.

Confirmation: You may hear other relays on the board click (for valves, drain pump) but not the heater relay. A single failed relay on an otherwise functional board still requires full board replacement — Samsung's dishwasher boards are not component-level repairable.

Part: DE92-04198A main control board — $160-$280.

Insufficient Hot Water Supply (15%)

Samsung dishwashers are designed to receive hot water from the home's supply — the internal heater boosts temperature from the incoming 110-120F up to the 130-160F target. If the dishwasher connects to a cold water line, or if the hot water heater is set below 110F, or if the hot water runs out before the dishwasher fills, the internal element cannot overcome the temperature deficit within the timeout.

Check: Run the kitchen faucet hot until water is at full temperature before starting the dishwasher. If your tank water heater is small (30-40 gallons) and you run a shower or laundry immediately before the dishwasher, the tank may be depleted.

Long-distance plumbing runs: In homes where the water heater is far from the kitchen, the first fill of the dishwasher receives water that has cooled in the pipes to ambient temperature. Running hot at the faucet for 30-60 seconds before starting the dishwasher ensures the first fill is actually hot.

Sump Insulation Loss (5%)

The sump assembly is designed to retain heat during the heating phase. Cracks in the sump housing or deteriorated sump gaskets allow heat to dissipate into the base pan area. The element works, the relay works, but heat escapes faster than it accumulates.

Parts and Pricing

Professional repair total (parts + labor + diagnostic): $180-$400

Practical Impact of Running Without Fixing HE

With HE active, Samsung dishwashers lock out the Sanitize function entirely and some models refuse to run any cycle. On models that allow operation with HE stored (clearing via reset), the dishwasher washes in cold/lukewarm water. This means:

• Grease is not dissolved — dishes come out with a film
• The Sanitize NSF standard (155F final rinse) is not met
• Detergent dissolves poorly below 110F, leaving residue and reducing cleaning effectiveness
• Drying performance drops significantly — the condensation drying method relies on hot rinse water evaporating off dishes

The HE-After-Self-Clean Dishwasher Trick

Samsung dishwashers do not have a self-clean cycle per se, but running the hottest cycle (Sanitize + High Temp Wash options combined) with vinegar or citric acid is a common cleaning method. If HE appears during this "deep clean" attempt, it is because the element was already weakening — the demanding max-temperature cycle exposed a marginal element that could barely maintain lower temperatures. The element needs replacement; the cleaning cycle just accelerated the diagnosis.

Samsung Dishwasher Diagnostic Mode for HE

Enter diagnostic mode by holding Start/Cancel for 3 seconds. Navigate to the heater test phase. During this test, the board energizes the heater element independently — you should be able to hear a faint change in the electrical sound from the sump area. On SmartThings-connected models, the app reports real-time water temperature during the test, confirming whether the element is producing heat.

Concealed vs. Exposed Elements: Why Samsung Uses Concealed

Samsung's concealed heating element (DD81-01950A) is embedded in the sump wall — you cannot see it from inside the tub. This design choice improves aesthetics (no visible element on the tub floor), protects the element from physical damage (dishes cannot fall on it), and allows for better heat distribution (the element heats the water surrounding it rather than radiating into the tub). The trade-off: the element is harder to access for testing and replacement, requiring access from below the unit rather than inside the tub.

Hard Water's Effect on Samsung Heater Elements

Hard water (above 10 grains per gallon) deposits mineral scale on the heater element's outer surface over time. This scale layer acts as an insulator — the element generates heat but the scale prevents efficient transfer to the water. The element temperature rises (because heat cannot escape into the water as quickly), accelerating the nichrome wire's thermal fatigue. Homes with hard water should expect shorter heater element life (4-6 years vs. 8-10 years in soft water areas). Running a monthly vinegar cycle dissolves scale buildup and extends element life.

HE and Energy Consumption

A partially degraded heater element that triggers intermittent HE is also wasting electricity. The element runs for the full timeout period before HE is logged — consuming full wattage for 10-15 minutes without successfully heating the water. This wasted energy adds approximately $5-$10/month to electricity costs if the condition persists. Repairing HE restores proper energy efficiency alongside wash performance.

Samsung dishwasher not heating water? Our technicians test the element and relay circuit to confirm the exact failure before ordering parts. Schedule diagnosis.