plumbing troubleshooting
Toilet runs intermittently
Common symptoms: running toilet; toilet refills; phantom flush; toilet noise
Stop and call a pro if:
- water on floor near electrical devices
Step-by-step diagnostic flow
Step 1
Is there water on the floor near electrical outlets or devices?
Step 2
How often do you hear the toilet refill on its own?
Step 3
Add a few drops of food coloring to the tank (not the bowl). Wait 10 minutes without flushing. Does color appear in the bowl?
Step 4
With the tank lid removed, observe the water level relative to the top of the overflow tube.
Do not remove any parts. Just observe the height.
Possible outcomes
Stop and seek professional help immediately
high confidencePotential electrical hazard with water present.
Possible tank-to-bowl leak at flapper/seat
high confidenceDye reached bowl without flushing, indicating tank water bypass.
- Photograph inside the tank showing flapper area
- Record frequency of refills and time of day
- Toilet brand/model (inside tank stamp)
- Photo of flush valve and flapper
Possible fill valve not shutting off completely
medium confidenceWater level above overflow suggests continuous topping off.
- Photograph water level relative to overflow
- Capture a short video of fill behavior after a flush
- Fill valve brand/model if visible
- Refill interval notes
Further professional diagnosis recommended
low confidenceNon-invasive checks inconclusive.
- Note noises, timing, and whether it happens at night/day
- Collect photos inside the tank
- Toilet model
- Any recent water quality changes
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