No Water Coming From One Tap: Mixer, Valve or Pipe Problem?

If no water is coming from one tap, but the rest of the house still has water, the problem is usually local to that tap, mixer, isolation valve, cartridge, aerator, flexi hose or the pipe feeding that fixture. If the whole house has no water, the issue is more likely to be the main supply, water meter, pressure issue or local water network.

For Brisbane, Gold Coast and South East Queensland homeowners, one tap suddenly stopping can be confusing. Sometimes it is a simple blocked aerator. Other times, it may be a failed mixer cartridge, seized isolation valve, blocked flexi hose, pressure issue, hot water fault or a hidden plumbing problem in the wall.

If one tap has stopped working, has weak flow, only hot or cold water, or no water at all, JR Gas & Water can help with practical plumbing services across Brisbane and the Gold Coast.

Quick Answer: Why Is No Water Coming From One Tap?

No water from one tap is commonly caused by:

• Blocked tap aerator

• Failed mixer cartridge

• Stuck or seized isolation valve

• Blocked flexi hose

• Kinked flexible hose

• Debris caught in the tap body

• Faulty tap washer or spindle

• Hot or cold supply issue to that fixture

• Blocked pipe branch

• Recently turned-off valve

• Airlock or pressure issue

• Water filter restriction

• Under-sink valve problem

• Pipework issue behind the wall

If only one tap is affected, the cause is usually close to that fixture. If several taps are affected, the issue may be broader.

First Step: Check Whether Other Taps Still Work

Before focusing on the tap itself, check the rest of the home.

Test:

• Kitchen tap

• Bathroom basin tap

• Shower

• Bath

• Laundry tap

• Outdoor tap

• Hot water taps

• Cold water taps

• Toilet cistern refill

• Dishwasher or washing machine connection if relevant

If every other fixture has normal water, the issue is likely local to the problem tap. If multiple fixtures have low flow or no water, the issue may involve the mains supply, hot water system, pressure, valves or pipework.

Is It No Hot Water, No Cold Water or No Water at All?

The next clue is whether the tap has lost hot water, cold water or both.

No Cold Water From One Tap

If the cold side does not work but the hot side does, the issue may be with the cold isolation valve, cold flexi hose, mixer cartridge, cold inlet, tap body or cold pipe branch.

This is common under kitchen sinks and bathroom vanities where hot and cold supplies are separated before entering the mixer.

No Hot Water From One Tap

If the hot side does not work but cold water does, the issue may be with the hot isolation valve, hot flexi hose, mixer cartridge, hot water pipe branch, tempering valve or local hot water restriction.

If every hot tap in the home has no hot water, the issue is more likely to be the hot water system. JR Gas & Water can help with hot water system services if the problem affects hot water across the home.

No Hot or Cold Water From One Mixer

If a mixer tap has no hot or cold water, the issue may be inside the mixer, at the isolation valves, in the aerator, in the flexi hoses or in the pipework feeding that fixture.

A complete loss of flow from one mixer often points to a local blockage or failed internal component.

Common Causes of No Water From One Tap

1. Blocked Tap Aerator

The aerator is the small mesh fitting at the end of many tap spouts. It softens the flow and helps reduce splashing.

Aerators can block with:

• Sediment

• Rust particles

• Scale

• Grit from plumbing work

• Debris after water main works

• Small particles from old pipework

• Filter carbon or cartridge debris

• Sand or tank sediment in rainwater systems

A blocked aerator may cause very weak flow or no visible water from the tap, even though water is reaching the mixer.

This is one of the simplest possible causes, but if debris keeps returning, there may be a bigger issue with pipework, water quality, hot water sediment or filtration.

2. Failed Mixer Cartridge

Most modern kitchen and bathroom mixers use a cartridge to control flow and temperature. If the cartridge fails, jams or blocks internally, the tap may stop flowing properly.

Signs of a mixer cartridge problem include:

• No water from the mixer

• Only hot or only cold water

• Stiff handle

• Loose handle

• Uneven flow

• Temperature hard to control

• Tap dripping after use

• Sudden drop in pressure from one tap

• Grinding or crunchy handle movement

If the mixer is good quality and parts are available, cartridge replacement may be possible. If the mixer is old, corroded or low quality, replacing the whole mixer may be more practical.

3. Isolation Valve Turned Off

Many sinks and vanities have isolation valves under the bench. These allow hot and cold water to be shut off to that fixture.

Sometimes an isolation valve has been turned off during cleaning, renovation, filter work, dishwasher work, tap replacement or plumbing repairs and not turned back on fully.

If one tap has no water after recent work, check whether the isolation valves are open.

Do not force an old or stuck valve. If the valve is seized, corroded or leaking, it may need replacement.

4. Seized or Faulty Isolation Valve

Even if an isolation valve looks open, it may be faulty internally. Old valves can seize, break, clog or fail to open fully.

A faulty valve may cause:

• No water to one tap

• Weak flow from one side

• No hot or cold water

• Leaking under the sink

• Valve handle spinning without effect

• Water not returning after being shut off

• Reduced flow after renovation or repair work

If an isolation valve is unreliable, replacing it can restore flow and make future maintenance easier.

5. Blocked or Kinked Flexi Hose

Flexible braided hoses are commonly used under sinks, vanities and some laundry tubs. If a hose is kinked, crushed, internally blocked or failing, water may not reach the tap properly.

Signs include:

• Weak flow from one tap

• No water from hot or cold side

• Visible kink in hose

• Rust or corrosion on hose ends

• Bulging or fraying

• Drips under the sink

• Flow problem after items were stored in the cabinet

• Problem after tap or filter work

A damaged flexi hose should be replaced rather than forced back into shape, especially if it shows corrosion or wear.

6. Debris Caught Inside the Tap

Small debris can lodge inside tap bodies, ceramic cartridges, washers, filters or internal passages.

This may happen after:

• Water main repairs

• Plumbing work

• Hot water system replacement

• Pipe repairs

• Renovations

• Old pipe disturbance

• Filter cartridge changes

• Turning water off and back on

• Pressure changes in the street

If debris has entered the mixer or tap, the flow may reduce suddenly or stop completely.

7. Faulty Washer or Tap Spindle

Older-style taps with separate hot and cold handles use washers and spindles rather than mixer cartridges.

A failed washer, damaged seat, jammed spindle or broken internal component can stop water flow or make the tap difficult to turn on.

Signs include:

• Tap handle turns but no water comes out

• Tap is stiff or loose

• Tap leaks around the spindle

• Water flow is inconsistent

• Tap needs to be turned harder than usual

• Tap has been repaired multiple times

Older taps may be repairable, but if the tapware is worn or corroded, replacement may be the better long-term option.

8. Water Filter Restriction

If the affected tap is connected to an under-sink water filter, reverse osmosis system or separate drinking water tap, the filter system may be restricting flow.

Possible causes include:

• Blocked cartridge

• Overdue filter replacement

• Closed filter valve

• Kinked filter tubing

• Incorrect cartridge installation

• Low tank pressure on reverse osmosis systems

• Faulty filter tap

• Blocked flow restrictor

• Sediment buildup in the system

If only the filtered water tap has no flow, the issue may be with the filter rather than the household plumbing.

JR Gas & Water can help with water filter systems and servicing where filter equipment is restricting flow.

9. Hot Water Tempering Valve Issue

If one or more hot taps have poor flow or no hot water, a tempering valve or hot water control valve may be involved.

A tempering valve blends hot and cold water to deliver safer hot water temperatures to fixtures. If it fails, blocks or restricts flow, hot water delivery can be affected.

This is more likely if the issue affects several bathroom hot taps rather than one isolated fixture.

10. Pipe Branch Blockage

Sometimes the issue is in the pipe feeding that tap. A local branch line can become restricted by corrosion, debris, scale, old galvanised pipework, valve failure or previous plumbing alterations.

This is more common in older homes, renovated homes and properties with mixed pipe materials.

Signs may include:

• One bathroom group affected

• Flow poor from several fixtures in one area

• Rusty water before flow stopped

• Old steel pipework visible

• Low pressure from one side of the home

• Flow worsens over time rather than suddenly

A plumber can help determine whether the tap, valve or pipe branch is the problem.

11. Air or Pressure Issue After Water Was Turned Off

If the water supply was recently turned off for plumbing work, water main works or renovation work, one tap may sputter, run slowly or temporarily stop flowing due to trapped air or disturbed debris.

Air usually clears after normal use. Debris does not always clear and may block aerators, cartridges or valves.

If the issue remains after the rest of the home is working normally, the affected fixture should be checked.

12. Rainwater Tank or Pump Supply Issue

In acreage and semi-rural homes, some taps may be connected to a rainwater tank, pump or separate water line. If only one tap or one group of taps has no water, the issue may relate to the pump, valve, filter, tank supply or pipe run.

Possible causes include:

• Pump not running

• Filter blocked

• Tank valve closed

• Low tank level

• Pressure switch fault

• Air in the line

• Blocked sediment filter

• Faulty changeover system

This is more common on larger properties where not every tap is connected the same way.

13. Recently Installed Tapware

If the tap has recently been replaced and now has poor flow or no water, the issue may be installation-related.

Possible causes include:

• Isolation valves not fully opened

• Flexi hoses kinked

• Hot and cold connections restricted

• Cartridge damaged by debris

• Aerator blocked from installation debris

• Mixer not suited to the setup

• Washer or seal obstructing flow

• Incorrect connection arrangement

The installer should check the connections, hoses, valves and aerator before assuming the tap itself is faulty.

What Different Symptoms Usually Mean

Tap Has No Water at All

If one tap has no water at all but other taps work, the issue may be a closed valve, blocked aerator, failed mixer cartridge, kinked hose or local pipe restriction.

Tap Has Weak Flow

Weak flow from one tap often points to a partially blocked aerator, flexi hose, cartridge, valve or pipe branch.

If flow has gradually worsened over time, pipe corrosion or sediment buildup may be involved.

Tap Splutters Then Stops

Spluttering may suggest air in the line, debris moving through the tap or water supply being interrupted. If only one tap splutters, local blockage is more likely.

Tap Has Cold Water but No Hot Water

The hot isolation valve, hot flexi hose, mixer cartridge, hot pipe branch or hot water control valve may be involved.

If all hot taps are affected, the hot water system should be checked.

Tap Has Hot Water but No Cold Water

The cold isolation valve, cold flexi hose, mixer cartridge or cold pipe branch may be involved.

Tap Flow Stops After Plumbing Work

Debris may have been disturbed and caught in the aerator, cartridge, valve or hose. This is common after water has been turned off and restored.

Tap Flow Stops After Filter Replacement

If the affected outlet is connected to a filter, the cartridge, shut-off valve, tubing or filter tap may be the issue.

What Homeowners Can Check Safely

You can safely check a few things before booking a plumber.

Check:

• Do other taps in the home work normally?

• Is the issue hot water, cold water or both?

• Are the under-sink isolation valves open?

• Has any plumbing or filter work been done recently?

• Is the aerator visibly clogged?

• Are flexi hoses kinked or crushed?

• Is there water leaking under the sink?

• Does the tap handle feel stiff or broken?

• Is the issue with a filtered drinking water tap only?

• Are neighbours also having water supply issues?

Avoid forcing stuck valves, dismantling mixers without experience, or disturbing old flexi hoses and fittings that may already be weakened.

When To Call a Plumber

Call a plumber if:

• One tap has no water and the cause is not obvious

• The isolation valve is stuck or leaking

• A flexi hose is kinked, corroded or damaged

• The mixer handle is stiff or faulty

• Hot water is missing from one or more taps

• Flow stopped after plumbing work

• Brown water or sediment appeared before flow stopped

• Water is leaking under the sink

• You suspect a pipe blockage

• The tap is inside a wall, shower or tiled area

• The problem keeps returning after cleaning the aerator

• You have an older home with possible galvanised pipework

A plumber can test the fixture, valve, hose and pipework to find the actual restriction.

No Water From a Kitchen Tap

A kitchen tap may stop flowing because of a blocked aerator, failed mixer cartridge, kinked flexi hose, isolation valve issue or water filter restriction.

Kitchen cabinets often contain multiple fittings, including:

• Hot and cold mixer hoses

• Isolation valves

• Dishwasher connections

• Water filter fittings

• Fridge water lines

• Pull-out spray hose connections

• Waste pipework

Because there are several possible causes under a kitchen sink, it is worth checking for leaks or recent movement inside the cabinet.

No Water From a Bathroom Basin Tap

Bathroom basin taps may lose flow due to mixer cartridges, isolation valves, flexi hoses, aerators or debris after plumbing work.

If the vanity is older or has swelling, dampness or corrosion underneath, the tap issue may be part of a broader plumbing maintenance problem.

No Water From a Shower

No water from one shower can be more complex because the mixer or taps may be inside the wall.

Possible causes include:

• Failed shower mixer cartridge

• Blocked shower rose

• Tap spindle issue

• In-wall valve problem

• Hot or cold water restriction

• Debris in the mixer

• Tempering valve issue

• Pipework problem behind the wall

If the shower is tiled and the issue appears to be inside the wall, it should be checked by a plumber before any invasive work is considered.

No Water From an Outdoor Tap

Outdoor taps may stop flowing because of a worn washer, stuck valve, blocked line, damaged pipe, isolation valve, pump supply issue or separate rainwater/tank setup.

Outdoor taps are also more exposed to weather, garden damage, hose pressure and corrosion.

If the tap is on a long external run or connected to tank water, the supply path may need to be checked.

No Water From a Laundry Tap

Laundry taps may be affected by washing machine valves, old pipework, isolation valves, mixer issues or debris.

If the washing machine also has poor flow, the issue may be with the laundry supply valves or pipework rather than the tap itself.

No Water From a Filtered Drinking Tap

If your standard kitchen mixer works but the filtered drinking tap does not, the issue is likely within the filter system.

Common causes include:

• Blocked cartridge

• Filter valve turned off

• Kinked tube

• Empty or low-pressure RO tank

• Incorrect cartridge installation

• Blocked filter tap

• Recently changed filter not flushed correctly

• Failed pressure limiting valve or fitting

Filter systems should be serviced based on the system type, household use and water quality.

Brisbane and Gold Coast Home Considerations

Across Brisbane, the Gold Coast and South East Queensland, one-tap flow problems can happen in many property types.

Older Brisbane homes may have ageing valves, older tapware, galvanised pipe sections or previous renovations with mixed plumbing. Gold Coast homes may have corrosion on fittings, especially near coastal areas. Newer builds may still have blocked aerators or valve issues after construction debris or plumbing work. Acreage homes may have tank, pump and filter setups that affect certain taps differently from mains-fed fixtures.

Because the cause can vary widely, the best repair starts with identifying whether the problem is the tap, valve, hose, pipe branch, filter or hot water system.

Repair or Replace the Tap?

Repair may be suitable when:

• The tap is good quality

• Replacement cartridges or parts are available

• The tap body is in good condition

• The issue is a simple aerator, cartridge or valve fault

• The tap still suits the room

• There is no corrosion or leakage around the base

Replacement may be better when:

• The mixer is old or low quality

• Parts are hard to source

• The handle is stiff, loose or damaged

• The tap has leaked before

• The body is corroded

• The tap has poor flow even after repairs

• The finish is badly worn

• You are renovating the kitchen, bathroom or laundry

In many cases, replacing a worn mixer is more practical than spending time and labour repairing a fixture that may fail again soon.

Can Low Water Pressure Cause One Tap To Stop Working?

Low water pressure usually affects more than one fixture. However, if one tap already has a partial blockage, low pressure can make the issue more obvious.

If pressure is poor across the whole home, the issue may involve:

• Water main supply

• Pressure limiting valve

• Leaks

• Old pipework

• Hot water system

• Filter system

• Pump setup

• Blocked valves

If only one tap is affected, local restrictions are more likely.

How JR Gas & Water Can Help

JR Gas & Water can inspect taps, mixers, valves, hoses, filters and pipework when one tap has no water or weak flow.

Depending on the issue, the job may involve:

• Checking hot and cold supply

• Inspecting under-sink isolation valves

• Checking flexi hoses

• Cleaning or replacing blocked aerators

• Testing mixer cartridge function

• Replacing faulty cartridges where suitable

• Replacing old or faulty tapware

• Checking water filter restrictions

• Inspecting hot water supply issues

• Checking for local pipe restrictions

• Replacing seized or leaking valves

• Assessing pressure-related issues

The aim is to restore water flow properly and identify why the tap stopped working in the first place.

For tap flow problems, mixer repairs, valve issues, filter restrictions and general plumbing repairs, book JR Gas & Water’s Brisbane and Gold Coast plumbing services.

FAQs About No Water Coming From One Tap

Why is no water coming from one tap but the rest of the house works?

If only one tap has no water, the issue is usually local to that fixture. Common causes include a blocked aerator, failed mixer cartridge, closed isolation valve, blocked flexi hose or local pipe restriction.

Why does my kitchen tap have no water?

A kitchen tap may have no water because of a blocked aerator, faulty mixer cartridge, closed isolation valve, kinked flexi hose or water filter restriction. If the kitchen has a pull-out mixer or under-sink filter, those fittings should also be checked.

Why does my tap have cold water but no hot water?

The issue may be with the hot isolation valve, hot flexi hose, mixer cartridge, hot water pipe branch or hot water control valve. If all hot taps are affected, the hot water system may be the cause.

Can a blocked aerator stop water completely?

Yes. If enough sediment, rust, grit or debris collects in the aerator, the tap may have very weak flow or appear to have no water. If the blockage keeps coming back, the source of debris should be investigated.

Can a mixer cartridge stop water flow?

Yes. A failed or blocked mixer cartridge can restrict or stop water flow. It may also cause stiff handle movement, poor temperature control, dripping or uneven flow.

What should I do if the isolation valve under the sink is stuck?

Do not force a stuck or corroded isolation valve. Forcing it can cause a leak or break the valve. A plumber can replace the valve and restore proper control to the fixture.

Why did one tap stop working after plumbing work?

Turning water off and back on can disturb sediment or debris. That debris may block the aerator, cartridge, flexi hose or valve at one fixture.

Should I replace the mixer if one tap has no water?

Not always. If the issue is a blocked aerator or valve, the mixer may not need replacing. If the mixer is old, corroded, low quality or has a failed cartridge with hard-to-find parts, replacement may be the better option.

Final Word

No water coming from one tap usually means there is a local problem with that tap, mixer, cartridge, aerator, flexi hose, isolation valve, filter or pipe branch. If the rest of the home still has water, the issue is usually close to the affected fixture.

If the problem involves hot water only, a filter system, seized valve, damaged hose or shower mixer inside a wall, it is best to have it checked properly before replacing random parts.

JR Gas & Water can inspect and repair tap flow issues across Brisbane, the Gold Coast and South East Queensland, including mixers, valves, hoses, filters, hot water supply and local pipe restrictions.

Book JR Gas & Water for practical plumbing help if one tap has stopped working or the flow has dropped suddenly.