Start with the symptom
The fastest way to diagnose a booster pump fault is to identify the symptom first: no water, low pressure, fluctuating pressure, pump running constantly, pump not starting, pump cycling, tripping electrics, leaking pipework or a control panel alarm.
Safe checks before calling
Do these visual checks only if safe and accessible.
- Take photos of the whole booster set
- Photograph any control panel fault code
- Check visible pressure gauge readings
- Confirm whether the issue affects all outlets or only one area
- Check whether there is water in the break tank if visible
- Note whether the pump is silent, running constantly or starting repeatedly
Common causes
Common causes include failed motors, inverter faults, pressure transducer faults, loss of pressure vessel charge, faulty non-return valves, leaking pipework, blocked strainers, low inlet water, incorrect set pressure and control panel faults.
When to call a pump engineer
Call for support if there is no water, repeated tripping, visible leaks, a live electrical fault, a persistent alarm, unstable pressure or if the pump set serves a commercial building, care environment, apartment block or other critical site.