Plumbing Repairs, Maintenance and Fault Finding
Domain 11 tests systematic fault finding and repair: gathering information, isolating, testing section by section, replacing the right part, and setting up a maintenance routine.
Method
- Take the complaint, check the whole system, isolate, then test one section at a time.
- Split the system: is the fault upstream (supply, tank, valve) or downstream (fixture, trap, drain)?
- Common faults: no water, low pressure, leaks, water hammer, a running cistern, a dripping tap, a slow drain, bad smell and backflow.
Repairs
- Tap: replace the washer or ceramic cartridge and resurface the seat.
- Cistern: replace the float valve or siphon and reset the water level.
- Leaking joint: remake it; a clamp or tape is a temporary measure only.
- Blockage: plunger, then auger, then jetting; chemical cleaners last and never mixed.
- Maintenance: clean tanks every six months, exercise valves, lag pipes before winter, jet drains.
Worked example
A first-floor tap has low pressure only when the ground-floor tap is opened. Reasoning: both draw from the same undersized branch, so opening one drops the pressure at the other. Check static pressure at the tank, the branch size and any partly closed valve; the fix is a larger branch or a separate connection, not a new tap.
Traps
Dismantling without isolating; replacing the tap when the stop cock is at fault; using tape on a compression olive; ignoring water hammer until a pipe bursts.