Plumbing

BuildingWrench repair guide

Plumbing

Commercial Sensor Faucet Won’t Turn On: What to Check First

When a commercial sensor faucet will not run, separate the problem into sensing, power, water supply, and solenoid operation. Many easy fixes involve batteries, a dirty sensor window, closed stops, a clogged aerator, or a model-specific reset.

Last reviewed 2026-09-12 · General facility-maintenance information, not a substitute for site procedures, manufacturer instructions, codes, or qualified professional judgment.

Routine facility fixSkill: BeginnerTypical time: 10–25 min
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Safety boundary

Isolate water before opening pressurized components and follow the manufacturer instructions for the exact fixture or valve.

Full troubleshooting steps are in Pro

The safety boundary, quick answer and stop-work conditions above stay free. Pro opens the likely causes, symptom table, step-by-step procedure and preventive maintenance for this guide.

Stop and call a licensed professional when

  • Water will not shut off and cannot be isolated
  • Wiring is damaged or wet
  • Hardwired power work is required
  • Valve body is leaking
  • Correct batteries/reset do not restore operation

Mistakes, FAQ, parts and tools

Pro opens the rest of this guide: common mistakes, field FAQ, the parts list, and the tools for the job.

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If only one faucet has weak flow, the restriction is usually local. Start with the aerator, then verify the stops are open and inspect supply hoses, inlet screens, and the cartridge before escalating.

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A bowl that rises unusually high during a flush is more often a drainage problem than a flushometer problem. Stop repeated flushing and clear the restriction first.

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Sensor Flushometer Won’t Flush? Check Power, Sensor, Solenoid & Water

When an automatic flushometer will not flush, work in order: power, sensor detection, actuator or solenoid, then water supply. That sequence prevents unnecessary valve tear-downs and parts swapping.