A pipe may be frozen if a tap suddenly produces no water or only a trickle after sub-zero weather, while other taps still work. It may thaw without bursting, but you cannot assume it is intact because expanding ice may already have split the pipe and leakage may begin only as the ice melts.
In Sydney, check the recent conditions at your property and how quickly pipes can freeze rather than assuming freezing is the cause. A closed valve, supply interruption, blockage or leak can produce similar symptoms.
Signs of a frozen pipe
The clearest sign is a local loss of flow combined with freezing conditions and visible changes to exposed pipework.
- No water or a weak trickle: Compare hot and cold water, then test other fixtures. One affected tap suggests a local fixture or branch-pipe problem; low flow throughout the property suggests a broader supply issue.
- Frost or ice: Frost on a safely visible pipe supports freezing as the cause, particularly if it supplies the affected fixture.
- A bulging, cracked or split pipe: Expanding ice can damage pipework. Leakage may not begin until the ice melts, so treat visible damage as a potential burst.
- Unusual noises: Banging, whistling or gurgling can accompany restricted flow, but do not confirm an ice blockage. Persistent pipe noises also warrant a plumber’s assessment.
Safe checks
Limit your checks to taps, accessible valves and pipework you can inspect safely.
- Test several taps, including hot and cold where available.
- Check that the accessible main isolation valve is open, but do not force or dismantle it.
- Check Sydney Water for a reported supply interruption and ask a nearby neighbour whether their water is affected.
- From a safe position, inspect exposed pipes for frost, swelling, cracks or water. Do not enter roof spaces, confined areas or unsafe locations.
Do not open walls or use flames, boiling water, electrical heaters or chemicals. Stop at observation rather than attempting to thaw, diagnose or repair concealed or pressurised pipework.
If the pipe may be split
Treat a bulging, cracked or leaking pipe as a potential burst. If water is escaping, stop using the affected fixture and close the main water isolation valve only if it is accessible and safe to operate.
Keep away from water near power points, appliances, switchboards or other electrical equipment. Do not touch wet electrical equipment or enter a flooded area.
If the pipe is damaged, leaking or inaccessible, contact our licensed burst-pipe plumbers for urgent assessment and repair.