Symptoms
- Sanitize option selected but the confirmation light never appears
- Cycle finishes but sanitize indicator stays off
- Overall wash performance seems normal otherwise
- Longer cycle times when sanitize is selected
Likely causes
- CommonIncoming water temperature too lowSanitize cycles require reaching a specific higher temperature that's harder to hit if incoming water is cold.
- CommonDoor opened during the cycleOpening the door partway through can cancel the sanitize certification even if the rest of the cycle finishes.
- PossibleHeating element underperformingA partially failing element can heat water for a normal wash but fail to reach sanitize-level temperatures.
- PossibleFaulty temperature sensorA miscalibrated or failing sensor can prevent the unit from confirming it hit the target temperature.
What to do
- Run the kitchen faucet nearest the dishwasher hot before starting to ensure the first fill isn't cold.
- Avoid opening the door at all during a sanitize cycle, even briefly.
- Confirm you selected the correct combination of options, since sanitize is often an add-on to a specific cycle, not standalone.
- Check your water heater setting, since very low incoming temperatures can prevent reaching sanitize thresholds even with internal heating.
- Run a normal cycle to confirm the dishwasher otherwise cleans and heats water fine.
- If sanitize never completes despite hot incoming water and a full uninterrupted cycle, a technician can test the heating element and temperature sensor.
Tools and parts
- None
When to call a pro
If a proper sanitize confirmation is important to you (such as for a household member with health needs) and it won't complete, have a technician verify the heating system.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.