How to Troubleshoot Single Tap Installation Issues

Quick answer (read this first)

• Verify water supply and shut-off valve positions.
• Inspect all tap connections for looseness or improper sealing.
• Clean the aerator if water flow is weak or inconsistent.
• Check internal washers or cartridge for correct installation if other fixes fail.

Safety first

• Crucially, turn off the main water supply to your home or the specific tap’s shut-off valve before any work.
• Wear appropriate eye protection.
• Use correct tools to avoid damaging components.
• Do not overtighten fittings, as this can cause damage.

Tools you may need

• Adjustable wrench or spanner
• Plumber’s tape (PTFE tape)
• Screwdriver (flathead and Phillips)
• Bucket or towel for spills
• Cleaning brush (for aerator)

Step-by-step

Step 1

1. Shut Off Water Supply: Locate and completely turn off the main water supply to your home or the specific shut-off valve for the tap you’re working on. Confirm water flow has stopped.

Step 2

2. Inspect for Leaks: Visually check all connections under the sink, particularly where the supply lines meet the tap, for any signs of water drips or dampness. Gently tighten any loose nuts using an adjustable wrench.

Step 3

3. Re-tape Leaky Threads: If tightening doesn’t stop a leak, turn off the water again. Disconnect the problematic fitting, remove old plumber’s tape, and apply new PTFE tape clockwise around the threads 3-5 times. Reconnect and tighten carefully.

Step 4

4. Clean the Aerator: If water flow is weak, erratic, or splashing, unscrew the aerator from the tap’s spout. Disassemble it and remove any accumulated debris, sediment, or mineral deposits using a small brush or toothpick. Rinse thoroughly and reassemble.

Step 5

5. Verify Supply Line Valves: Ensure both hot and cold water supply line shut-off valves under the sink are fully open. If only one side has low/no flow, this valve might be partially closed.

Step 6

6. Check for Supply Line Clogs: If one specific water temperature (hot or cold) has no or significantly reduced flow, carefully disconnect that particular supply line from the tap. Place the disconnected end into a bucket and slowly open the corresponding shut-off valve to check for water flow. If flow is good, the issue might be within the tap itself; if poor, the supply line might be clogged.

Step 7

7. Inspect Tap Cartridge/Washers: If troubleshooting external components doesn’t resolve issues like persistent drips from the spout or difficulty turning the handle, the internal cartridge or washers might be faulty. Consult your tap’s specific manual for guidance on inspection and replacement, as this can be intricate.

Common mistakes

• Failing to turn off the main water supply before attempting any repairs, leading to flooding.
• Overtightening fittings, which can strip threads, damage pipes, or crack ceramic components.
• Using incorrect tools (e.g., wrong wrench size) that can strip nuts or damage finishes.
• Neglecting to clean the aerator, a common cause of low or erratic water flow.
• Improperly applying plumber’s tape (e.g., winding it counter-clockwise, using too little, or not on clean threads), leading to persistent leaks.

When to call a professional

• If you cannot locate or safely turn off the main water supply valve to your property.
• If leaks persist even after carefully tightening connections and re-taping threads.
• If you suspect a damaged pipe, a major blockage within the wall, or widespread plumbing issues.
• If you are uncomfortable or unsure about disassembling and replacing internal tap components like cartridges or washers.
• If the problem extends beyond a single tap, affecting multiple fixtures or your entire home’s water system.