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Flush tank repair: wall-hung toilet and concealed flush button
Plumber30-day warranty included

Flush tank repair

Takes about 45 min

If your cistern keeps hissing after a flush, takes ages to refill or leaks at the base, the fault is usually inside the tank. A verified plumber lifts the lid, checks the fill valve, float, flush valve seal and button linkage, then adjusts, cleans or reseats the part that is failing.

Most repairs take about 45 minutes, starting from the price shown on this page. When the inner mechanism is too worn to repair, you can choose the new flush mechanism option, with its price shown before you book. Keep the area above the toilet clear, and tell the plumber the make of your cistern if you know it, since mechanisms vary.

What's included

  • Inside of the cistern checked part by part
  • Fill valve and float adjusted for the right level
  • Flush valve seal cleaned or reseated
  • Button or lever linkage reset
  • Flush and refill test before leaving
  • 30-day warranty on the repair

What's not included

  • A new flush mechanism, available as an option
  • Replacing the whole cistern
  • Concealed cistern repairs that need wall opening

How the visit goes

  1. 1

    Watch a flush

    The plumber flushes and watches the refill to see where water is lost or where it stops.

  2. 2

    Open the tank

    The lid is lifted and the fill valve, float, seal and linkage are checked.

  3. 3

    Adjust or reseat

    The float is set, the seal is cleaned and the linkage is reset, or the new mechanism is fitted if you chose it.

  4. 4

    Test several flushes

    The toilet is flushed a few times to confirm a full flush and a clean shut-off.

What we need from you

  • Clear space above and around the cistern
  • The cistern make, if you know it

Questions about this service

Why does my flush keep running?

Usually the flush valve seal or the float is not seating, so water trickles into the bowl. The plumber cleans or adjusts it and suggests a new mechanism only if it is worn out.

When do I need the new flush mechanism option?

When the valve or seal is cracked or brittle and will not seal again. The plumber shows you the worn part before fitting a new one.

Can you repair a concealed cistern?

If it can be reached through the button plate, yes. Work that needs the wall opened is civil work and outside this service.

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