Shower Keeps Running: Separate the Valve, Tank, and Drain Causes

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   From a dry, safe position, identify whether the continuing water or sound comes from the showerhead, tub spout, handle or trim, the wall or ceiling, the water-heater tank, a relief discharge, or the drain. Record whether the shower handle is fully off and whether the flow is a steady stream, a brief drip, or a delayed trickle.

   Expected result: A steady stream continues at the outlet, only a few drops appear, water emerges from the valve or wall, or the tank is humming, filling, or discharging.

   Next step: Follow the matching branch below. If the source is hidden, the water is hot, or water is reaching the floor, ceiling, electrical equipment, or gas appliance, stop and call a plumber or emergency service.

   Stop if: Stop for scalding water, active flooding, a hidden leak, water near electrical equipment, gas odor, smoke, or a damaged or seized valve.

   Why this matters

   Why: A steady outlet stream points to valve or supply control; a brief drip can be residual water or delayed flow; water at the wall or tank raises a leak concern; tank noise or discharge is not fixed by replacing a showerhead.

2. Check 2

   Turn the shower control to its normal off position without force and observe the outlet from a safe distance. If the model has an external, clearly identified local stop that is safely reachable, note whether closing it stops the flow; do not remove trim, loosen fittings, or force a stuck stop.

   Expected result: The flow stops immediately, changes to a short drip, continues steadily, moves between the showerhead and tub spout, or the stop will not operate normally.

   Next step: Leave a continuing-flow or failed-stop condition isolated if safely possible and arrange licensed plumbing service. Do not try to repair a cartridge or valve while pressurized or without the model instructions.

   Stop if: Stop for a seized handle or shutoff, uncontrolled flow, water escaping behind trim, scalding water, or any need to open the wall or use force.

   Why this matters

   Why: Immediate stop makes a permanently open valve less likely. A brief drip can be residual or delayed flow. Continued steady flow, cross-flow, or a failed stop suggests a valve, cartridge, seal, supply, or installation fault and can waste water or damage the building.

3. Check 3

   If the outlet changes from a stream to a brief drip after shutoff, observe from a safe position without repeatedly cycling the valve. Note how long the residual water lasts, whether it comes from only the showerhead or tub spout, and whether it stops without water appearing at the wall or ceiling.

   Expected result: The drip ends on its own, returns as a steady stream, appears at both outlets, or is accompanied by back-pressure, wall moisture, or a ceiling stain.

   Next step: If the drip ends and no damage is visible, record the pattern and monitor without disassembly. If it persists, returns, or reaches the wall or ceiling, keep the supply closed if safe and call a plumber.

   Stop if: Stop for a steady stream, active wall or ceiling leak, scalding water, or any need to remove a cartridge or trim under pressure.

   Why this matters

   Why: A short, self-ending drip can be water remaining in the riser or a model-specific thermal or back-pressure effect. A renewed stream, cross-flow, or building moisture is not normal residual drainage and needs valve or leak diagnosis.

4. Check 4

   If the running sound or water is near the water-heater tank, inspect only its dry, external, accessible area for water at top fittings, the bottom, the drain outlet, or the temperature-and-pressure relief discharge. Do not touch the relief lever, remove panels, or reach around hot or gas-fired equipment.

   Expected result: The tank area is dry, water is at a fitting or drain, water is coming from a relief discharge, the tank body appears wet, or the tank is refilling after normal shower use.

   Next step: If water is present, shut off the water or fuel only when the control is safely reachable and the exact manual permits it, stay clear of hot surfaces, and call a licensed plumber. If dry but the tank runs continuously or hot water is abnormal, arrange water-heater service.

   Stop if: Do not cap or operate the relief device, drain the tank, open covers, touch wiring, relight gas equipment, or continue with a gas odor, smoke, hot discharge, or flooding.

   Why this matters

   Why: Normal recovery after a draw is different from an active leak. Water at fittings, a relief discharge, or the tank body can indicate pressure, connection, valve, condensation, or tank failure; those possibilities cannot be separated safely by forcing a test.

5. Check 5

   Record whether the sound continues only while the shower is in use or continues after all fixtures are off. Observe the shower drain and nearby floor for standing water, slow drainage, or water returning from another fixture; do not pour chemicals or open a drain trap as a response to a tank sound.

   Expected result: The sound ends after the shower stops, continues with no water use, water drains normally, water backs up, or the floor becomes wet.

   Next step: Leave the affected fixture or heater off if water is backing up or the source is uncertain and arrange plumbing service. Do not use drain chemicals, force a cleanout, or keep the tank firing to reproduce the sound.

   Stop if: Stop for sewage backup, active flooding, water near electrical equipment, hot discharge, gas odor, or any need to access concealed plumbing.

   Why this matters

   Why: A sound tied to a draw may be demand or normal tank recovery, while a continuing sound with no use points to a leak, valve, relief, recirculation, or water-heater condition. Drain backup can make water appear to be running even when the supply valve is closed.

6. Check 6

   Record the shower brand, model, valve type, and whether any cartridge, mixer cap, pressure-balancing unit, or trim was recently installed or serviced. Compare the symptom only with that exact manufacturer's support or manual; do not treat another valve family's seal or installation detail as universal.

   Expected result: The model matches an official constant-run or delayed-flow instruction, recent valve work preceded the symptom, or no exact model guidance is available.

   Next step: Follow only the exact model's visible, water-isolated instruction. If the flow persists, the model is unknown, or repair requires cartridge or wall access, call a licensed plumber.

   Stop if: Do not dismantle a pressurized valve, substitute parts, force a stop, or continue operation with a leak or water behind the trim.

   Why this matters

   Why: Kohler's official examples tie constant running after service to specific seal and mixer-cap placement conditions, while delayed dripping can depend on installation materials and thermal behavior. A nonmatching model remains unresolved.

7. Check 7

   Prepare a service record with the outlet or tank source, steady versus delayed flow, whether the control or local stop closed it, fixture and tank observations, water temperature, model information, recent work, and any leak, gas, or electrical symptom. Stop testing once a service trigger exists.

   Expected result: The record points to a shower valve, residual or delayed flow, tank leak or discharge, drain backup, hidden supply issue, or an unresolved combination.

   Next step: Keep the relevant fixture, supply, or water heater out of service as directed and contact a licensed plumber. Use emergency gas, electrical, fire, or medical response first for the associated hazard.

   Stop if: Do not force valves, open walls, remove panels, touch relief devices, relight gas equipment after odor, or keep running water to test the diagnosis.

   Why this matters

   Why: The first wet point and timing help a plumber distinguish a valve seal problem from tank demand, pressure, relief, leak, or drain behavior without asking the resident to reproduce a flood or hot discharge.