A tap may stop working because its aerator is blocked, an isolation valve is closed, the handle or cartridge has failed, or the supply is interrupted. Check whether the problem affects one tap, one water temperature or the whole property to narrow down the cause.
Likely causes
- One tap only: The fault is probably at that outlet. Gradually reduced or uneven flow often points to a blocked aerator. No flow may result from a closed isolation valve, failed tap mechanism or local obstruction.
- Hot or cold only: The affected supply branch may have a fault. If there is no hot water, do not open or adjust the hot-water system; it can involve scalding water, electricity, gas and pressure.
- Several or all taps: The property water supply may have been turned off, the network supply may be interrupted, or there may be a significant leak or restriction. If nearby properties are also affected, a network issue is more likely.
A gradual decline usually indicates debris or another restriction. Sudden loss of flow is more consistent with a closed valve, failed mechanism or supply interruption.
What to check safely
- Test other taps: Establish whether the problem affects one outlet, one area or the whole property.
- Compare hot and cold: Test both sides of a mixer tap without dismantling it. Stop if the issue appears connected to hot-water equipment.
- Check for recent isolation: Ask whether anyone turned off the property supply or an under-sink isolation valve. You can visually inspect an accessible valve, but do not force it if it is stiff, corroded or leaking; failure could release pressurised water.
- Check for an outage: If several taps have no water, check Sydney Water’s current outage information. Contact Sydney Water if an outage is listed or neighbouring properties have also lost supply.
- Inspect the tap: Look for a loose handle or visible debris around the aerator. Remove or clean the aerator only if the manufacturer’s instructions confirm it is user-serviceable. Do not dismantle the tap body, cartridge or pipework.
- Look for leaks: Damp cabinetry, unexplained running-water sounds or water emerging from walls or floors may indicate a concealed leak. If water is actively escaping, use the property isolation valve only if it is safely accessible, then contact a licensed plumber.
Contact a licensed plumber if the cause remains unclear, a valve or tap component is seized or damaged, one supply branch has failed, or there are signs of concealed leakage. Our Sydney plumbing team can inspect the tap, isolation valve and private supply pipework.