Repairs and problems
Cistern taking too long to refill
At a glance
- Debris in the fill valve filter is the most common cause, especially after other work on the supply.
- A partly closed isolator, often knocked during cleaning, produces exactly the same symptom.
How this is diagnosed
Point 1
Debris in the fill valve filter is the most common cause, especially after other work on the supply.
Point 2
A partly closed isolator, often knocked during cleaning, produces exactly the same symptom.
Worth checking on site
Debris in the fill valve filter is the most common cause, especially after other work on the supply.
Common questions
Is it a pressure problem?
It can be on a gravity system, particularly for an upstairs WC with a low tank.
Is a slow fill harmful?
Only inconvenient, unless it is a symptom of debris that will affect other fittings.
Second opinion on slow filling cistern
If you already have a quote or a design and something does not sit right, it is worth another set of eyes before work starts.