Symptoms
- Handle turns with no resistance
- Water flow doesn't change as the handle turns
- Handle may feel loose side to side as well
- Problem appeared suddenly after normal use
Likely causes
- CommonStripped cartridge or stemInternal splines or threads wear smooth and no longer engage the valve.
- CommonBroken handle-to-stem connectionThe set screw or adapter connecting handle to stem has failed.
- PossibleSheared stem inside the faucet bodyThe stem itself has snapped, usually from over-tightening or age.
- PossibleWorn handle adapter (on faucets with a separate adapter piece)Common on some single-handle designs.
What to do
- Turn off the water supply under the sink immediately since flow can't be controlled at the handle.
- Remove the handle and inspect where it connects to the stem or cartridge for stripped splines or a broken set screw.
- If only the connection point is damaged, a replacement handle or adapter may solve it without replacing the whole cartridge.
- If the stem or cartridge itself is stripped, remove it fully and take it to a hardware store to match a replacement.
- Install the new cartridge or stem, making sure it seats fully before attaching the handle.
- Reattach the handle and confirm it now firmly controls water flow through its full range.
- Turn the water back on and test hot and cold shutoff completely before considering it done.
Tools and parts
- Screwdriver
- Adjustable wrench
- Pliers
Faucet handle adapter or cartridgeSearch: “faucet handle adapter replacement [brand]”
When to call a pro
Call a plumber if you can't shut off the water at the main or fixture shutoff and the faucet keeps running.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.