Step-by-step fix
Step 1: Confirm the control module is the likely problem
- Check that the faucet shutoff valves under the sink are open.
- If your faucet uses batteries, install fresh batteries or confirm the power pack is connected securely.
- Clean the sensor window on the faucet with a soft damp cloth and remove anything blocking it.
- Try the faucet again and listen for any click from the control box or solenoid when you place your hands in front of the sensor.
- Look under the sink for the control module and inspect for corrosion, water drips, loose plugs, or damaged wires.
If it works: You have ruled out the simple causes and the control module still looks like the most likely failed part.
If it doesn’t: If the faucet starts working after opening the valves, restoring power, or cleaning the sensor, you do not need to replace the module.
Stop if:- You find active leaking onto electrical parts under the sink.
- The wiring insulation is burned, melted, or badly damaged.
- The faucet body, sensor cable, or solenoid connection is broken and the module is clearly not the main issue.
Step 2: Shut off power and set up the work area
- Clear out the cabinet so you can reach the module comfortably.
- Place a towel under the work area to catch minor drips and protect the cabinet floor.
- Disconnect the faucet power source by removing the batteries or unplugging the low-voltage power connection.
- If the module sits where a line may drip during removal, close the faucet shutoff valves under the sink.
If it works: The faucet is de-energized and the area is ready for safe removal.
If it doesn’t: If you cannot safely reach the module or power connection, improve access before continuing.
Stop if:- The shutoff valves will not turn and are leaking around the stems.
- There is standing water in the cabinet around electrical connections.
Step 3: Document and disconnect the old module
- Take a clear photo of the module and every wire or hose connection before unplugging anything.
- Label the connectors with tape if several plugs look similar.
- Unplug the sensor lead, solenoid lead, and power lead from the old module one at a time.
- Release any clips, screws, or hook-and-loop straps holding the module in place and remove the old module.
If it works: The old module is out and you have a clear record of how everything was connected.
If it doesn’t: If a connector will not release, look for a locking tab and press it gently instead of pulling harder on the wire.
Stop if:- A connector is fused in place, badly corroded, or breaks apart during removal.
- Removing the module exposes hidden water damage or rotted cabinet material.
Step 4: Install the new touchless faucet control module
- Compare the new module to the old one and make sure the connector layout and mounting style match.
- Mount the new module in the same position as the old one so the wires reach naturally without strain.
- Reconnect each plug to the matching port using your photo as a guide.
- Push each connector in fully until it feels seated and route the wires so they will not rub on sharp edges or get pinched by stored items.
If it works: The new module is mounted securely and all connections are fully seated.
If it doesn’t: If the new module does not match the old one closely enough to connect cleanly, stop and verify the replacement part before forcing anything.
Stop if:- The replacement module does not fit the existing connectors or mounting arrangement.
- Any wire must be stretched tight to reach the new module.
Step 5: Restore power and water, then test the sensor
- Reinstall the batteries or reconnect the power source.
- Reopen the shutoff valves if you closed them.
- Wait a few seconds for the module to power up, then place your hands in front of the sensor.
- Run the faucet several times and check that water starts and stops normally.
- Look under the sink while the faucet runs and make sure no connection was disturbed and no leaks are present.
If it works: The faucet responds to hand movement normally and there are no leaks or loose connections under the sink.
If it doesn’t: If the faucet still does not respond, recheck every connector, confirm the power source is good, and compare the new module ports to your reference photo.
Stop if:- Water is leaking from a supply connection, solenoid area, or faucet hose after reassembly.
- The module powers up but wiring gets warm, smells hot, or behaves erratically.
Step 6: Make sure the repair holds in normal use
- Use the faucet several times over the next few minutes with both quick and longer hand movements.
- Check that the sensor does not trigger randomly when no one is at the sink.
- Open the cabinet one last time and confirm the module is secure, the wires are dry, and nothing is hanging where it can be snagged.
- Put the cabinet contents back carefully so they do not press on the module or wiring.
If it works: The faucet works consistently in real use and the new control module stays dry and secure.
If it doesn’t: If the faucet is still inconsistent after the module replacement, the problem may be with the sensor, solenoid, power supply, or faucet wiring rather than the module alone.
Stop if:- The faucet turns on by itself repeatedly or will not shut off reliably after the replacement.
- You see recurring moisture around the module area that could damage the new part.
Replacement Parts
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FAQ
How do I know the control module is bad and not just the batteries?
Start with the simple checks first. Replace the batteries or confirm the power pack is connected, clean the sensor, and make sure the shutoff valves are open. If the faucet still does not respond correctly and the module has visible corrosion, loose connections, or no proper output to the rest of the system, the module becomes a likely cause.
Do I need to shut off the water to replace the control module?
Usually you only need to disconnect power. But if the module sits in a spot where a hose or fitting may drip during the work, closing the shutoff valves is a smart extra step.
Can I replace the module without removing the whole faucet?
In most cases, yes. The control module is typically mounted under the sink and can be replaced from below without removing the faucet body.
What if the new module does not have the same connectors?
Do not force it. A replacement module needs to match your faucet's connector style and layout. Recheck the exact faucet information and compare the old and new parts before continuing.
The faucet still does not work after replacing the module. What else could be wrong?
The sensor, solenoid, power supply, wiring harness, or a water supply issue may be the real cause. Recheck the connector seating and power first, then move on to those other parts if the module replacement did not solve it.