Kenmore Dishwasher SANITIZE LED BLINKS Error: Sanitize Temperature Not Reached
The kenmore dishwasher sanitize led blinks error is a fault signal from the control board — this guide walks through what it means, common causes, and safe diagnostic steps. What Does the Kenmore Dishwasher Sanitize LED Blinking Mean? When the Sanitize indicator LED blinks at the end of a cycle on Kenmore 665 Ultra Wash […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. The Sanitize LED blink is a notification, not a mechanical fault. The dishwasher cleans normally — it simply did not achieve the thermal sanitize threshold. It is safe to use for everyday cleaning; only high-risk scenarios (immunocompromised household members, baby items) require the sanitize feature to function reliably.
Can I reset the code?
Yes. The Sanitize LED alert clears at the start of the next cycle or by pressing and holding Heated Dry for five seconds on most Kenmore 665 Ultra Wash models. If the root cause (low water temperature or failing element) is not addressed, the LED will blink on subsequent sanitize cycles.
When to stop immediately?
Stop if you notice: Sanitize LED blinks on every cycle even with incoming water confirmed above 120°F, Dishes are not hot to the touch immediately after cycle completion with Sanitize option selected.
Symptoms You May Notice
Sanitize LED blinks or remains illuminated in a fault pattern at cycle completion
The indicator activates at the end of a cycle where the Sanitize option was selected, signaling that the board could not confirm the final rinse reached 150°F — the NSF/ANSI 184 threshold for residential dishwasher sanitization.
Dishes do not feel hot immediately after the door is opened at cycle end
A successful sanitize rinse leaves the dishwasher interior notably hot — dishes are too hot to handle comfortably right after the door opens. If dishes are only warm or cool, the rinse temperature was insufficient.
Sanitize LED blinks on every cycle despite adequate incoming water temperature
When the Sanitize alert is persistent rather than occasional, the fault is typically the heating element or thermistor rather than low incoming water temperature from the household water heater.
Cycle runs 30 to 60 minutes longer than normal
The dishwasher keeps running well past its usual cycle length because the board repeatedly re-energizes the heater trying to reach 150 degrees — the displayed time estimate stalls and creeps upward before the cycle finally ends.
Possible Causes
Incoming household water temperature below 120°F
The dishwasher heater supplements the incoming hot water but requires a starting temperature of at least 120°F to reliably reach 150°F in the rinse phase. A water heater set below 120°F or a long supply line that loses heat before reaching the dishwasher causes the Sanitize alert on an otherwise functional machine.
DIY PossibleDegraded or failed heating element reducing maximum achievable temperature
An element that still functions at reduced wattage — due to a partial internal failure — can heat water but not to the full temperature required for sanitization. The element tests within range on continuity but at higher-than-expected resistance.
DIY PossibleThermistor reading lower than actual water temperature
A drifted thermistor that reports temperatures 10–20°F below actual causes the board to believe the sanitize threshold was not met even when the water reached 150°F. This is a relatively rare cause but produces a Sanitize LED blink pattern identical to a genuine temperature failure.
Requires ProfessionalSafe Checks You Can Do
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1
Verify incoming water temperature at the kitchen sink
Turn on the hot water at the kitchen sink and let it run for 60 seconds to purge any cool water from the supply line. Hold a cooking or candy thermometer under the stream. The reading should be 120–125°F for the dishwasher to reliably achieve sanitize temperatures. If it reads below 115°F, increase the water heater thermostat setting.
Running the kitchen hot water for 60 seconds before starting the dishwasher pre-flushes the supply line — the dishwasher's first fill uses the hottest available water and has a better chance of reaching sanitize temperature.
Tools required -
2
Run a diagnostic cycle to confirm the heater reaches temperature
On Kenmore 665 models with the diagnostic mode available (Heated Dry → Normal Wash → Heated Dry → Normal Wash in quick succession), initiate the self-test and allow it to run a full wash-heat-drain sequence. If the Sanitize LED illuminates solid (not blinking) at the end, the heater is functioning and the incoming water temperature was the variable. If the LED blinks again, the element or thermistor needs testing.
On some Kenmore 665 models, the Sanitize LED blink notification can be cleared by pressing and holding the Heated Dry button for five seconds — this acknowledges the alert without indicating the underlying issue was resolved.
When to Call a Professional
Contact a qualified technician if:
- Element continuity is present but resistance is above 40 ohms — partial failure requiring replacement
- Thermistor reads 15°F or more below actual water temperature confirmed by a probe thermometer — sensor replacement needed
- Code persists after element replacement — control board thermistor input circuit diagnosis required
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