Symptoms
- Faucet doesn't respond to hand movement
- Indicator light (if present) is off or blinking
- Faucet worked fine until recently
- Manual override button also doesn't run water
Likely causes
- CommonDead or low batteriesMost touchless faucets run on AA batteries in a box under the sink.
- CommonSensor lens dirty or blockedSoap film, water spots, or debris can block the infrared sensor.
- PossibleLoose or disconnected wiring under the sinkConnections can jostle loose during other under-sink work.
- PossibleFaucet in a locked or paused modeSome models have a manual switch that disables the sensor.
What to do
- Locate the battery pack under the sink and replace the batteries with fresh ones of the correct type.
- Wipe the sensor lens on the faucet spout with a clean, soft cloth to remove any film or residue.
- Check for a manual/power switch under the sink and make sure it's set to the on or auto position.
- Check that all wiring connectors under the sink are firmly seated.
- Try the manual override button on the faucet, if it has one, to confirm water flow works mechanically.
- If it now works, run it a few times to confirm the sensor consistently detects your hand.
- If nothing restores function, check the manufacturer's troubleshooting guide for a reset procedure specific to that model.
Tools and parts
- Screwdriver
- Soft cloth
AA batteriesSearch: “AA batteries for touchless faucet”
When to call a pro
Call a plumber or the manufacturer's support line if the sensor still doesn't respond after fresh batteries and a clean lens, which may indicate a failed sensor module.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.