Glacier bay toilet fill valve keeps running — fill valve

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

1. Check 1

   If water is rising uncontrollably, turn the toilet's accessible supply valve clockwise until the flow stops, keep towels away from electrical equipment, and do not keep flushing while the tank or floor is overflowing.

   Expected result: The local valve stops the flow, does not turn, leaks at the connection, or water has already reached the floor, wall, or electrical equipment.

   Next step: If the supply cannot be safely stopped or water is reaching building materials or electrical equipment, leave the supply off if safe and arrange plumbing service. Otherwise continue with the tank-lid checks.

   Why this matters

   Why: A controllable toilet allows a visual diagnosis; a seized or leaking shutoff or uncontrolled water creates a water-damage and service risk.

2. Check 2

   Remove the tank lid and compare the resting water level with the marked line on the flush-valve overflow tube; look for a visible stream entering the tube.

   Expected result: The level is above the mark and water enters the overflow, the level is at the mark, or the level is below the mark with the valve still running.

   Next step: For an above-line level, use the exact model's float adjustment. For a level at or below the line, close the supply and perform the 30-minute level test before replacing parts.

   Why this matters

   Why: Above-line water supports overfill or a fill valve set too high. A level at the line requires a leak-versus-valve test. A low level with continued running can reflect a tank leak or a valve that cannot reach shutoff.

3. Check 3

   For the specified single-flush Glacier Bay models, lower the float cup with the fill-valve adjustment rod as directed, then refill and observe whether the valve shuts at the marked line.

   Expected result: The valve stops at the line, still fills above the line, or the adjustment rod, float, or valve layout does not match the cited model procedure.

   Next step: Repeat only the model-approved small adjustment if needed. If it still overfills, or the model is not 340-995/686-826, stop using this procedure and follow the exact manual or arrange service.

   Why this matters

   Why: Stopping at the line supports an incorrect float setting as the cause. Continued overfill or a different valve layout means adjustment alone has not established a safe repair.

4. Check 4

   When the water is at the line, close the supply valve, mark or remember the tank level, and wait 30 minutes without flushing.

   Expected result: The tank level drops, or it remains at the same level while the supply is off.

   Next step: If the level drops, inspect the flapper and chain slack or use the specified food-coloring bowl test for an existing installation. If stable, reopen the supply and proceed to the exact-model fill-valve inspection.

   Why this matters

   Why: A drop means water is escaping through the flapper or flush-valve seal. A stable level makes a tank-to-bowl leak less likely and supports a fill-valve shutoff or debris issue when the supply is reopened.

5. Check 5

   If the 30-minute level stays stable and the toilet is one of the specified single-flush models, shut the supply off, unlock the fill-valve cap as directed, check for loose debris, and briefly flush with a plastic cup over the valve to limit spray before reassembling.

   Expected result: Debris is present and the valve shuts after cleaning, no debris is visible, or the cap will not unlock smoothly or the valve remains running.

   Next step: Turn the supply off before locking the cap back in place and retest. If the issue persists, the model procedure points toward fill-valve replacement or service; do not force the cap or generalize this step to another model.

   Why this matters

   Why: Debris can prevent the fill valve from opening or closing properly. No improvement, a seized cap, or damage means cleaning has not proven a safe repair.

6. Check 6

   For a dual-flush 215-583, check the flush-valve washer and seal only through the model-specific procedure, with the water off; for any model, reopen the supply slowly and inspect the bowl, overflow, supply connection, floor, and base through a full refill.

   Expected result: The dual-flush seal is bubbled or warped, the valve shuts cleanly with no bowl flow or floor leak, or running or leakage returns.

   Next step: Replace or service a damaged assembly only with exact model instructions. If running returns, the base leaks or rocks, or water appears outside the tank, shut the supply off if safe and arrange service.

   Why this matters

   Why: A damaged dual-flush seal can require the complete flush-valve assembly, while a clean stable retest supports a resolved adjustment or debris issue. Recurrence or external leakage needs a broader diagnosis.