Shower Valve Repair

Signs of a Failing Shower Valve

Shower valve problems are usually gradual: a drip after shutoff that gets steadier, a handle that gets harder to turn, or water that suddenly runs hot or cold when someone flushes.

• The shower head drips after shutoff
• Water won't get hot, or the temperature swings
• Stiff or loose handles
• Low flow at the shower only

Pressure-Balancing vs Thermostatic Valves

• A pressure-balancing valve keeps the hot-to-cold ratio steady when pressure drops on one side, for example when a toilet flushes. Most homes have this type.
• A thermostatic valve holds a set temperature and lets you control flow separately. It costs more but gives finer control.
• Both protect against sudden scalding. Many plumbing codes require one or the other when a shower valve is replaced.

How a Shower Valve Is Repaired

The plumber shuts off the water, removes the trim, identifies the valve and replaces the cartridge or seals. The anti-scald limit is reset so the shower can't run too hot.

1. Shut off the water and remove the trim.
2. Identify the valve and its cartridge.
3. Replace the cartridge, seals or valve body.
4. Set the anti-scald limit stop and test the temperature.

What Affects the Cost of Shower Valve Repair

Cost mainly depends on whether a cartridge fixes it or the valve body has to be replaced, and how the valve can be reached.

• Cartridge replacement versus a new valve body.
• Access through a panel behind the shower or through the tile.
• Parts availability for the valve brand.
• Code requirements for pressure-balancing or thermostatic valves.

When a Shower Valve Problem Is Urgent

• The shower won't shut off.
• Water is leaking behind the wall.

Scale and Shower Cartridges

Hard water wears out shower cartridges sooner. San Jose's groundwater measures 11 to 26 grains per gallon and Las Vegas water 16 to 17, and in water like that, scale makes handles stiff and causes drips after shutoff. In soft-water cities like Portland and Boston, cartridges mostly fail from age.

Local plumbing details: San Jose, Las Vegas, Portland, Boston

Hard Water Scale by City

What our city pages say about hard water scale:

• Queen Creek, AZ: Scale builds in water heaters, tankless units, faucets and shower valves.
• Lincoln, NE: At about 11 grains per gallon, scale builds up in water heaters, fixtures and appliances.
• St. George, UT: Scale builds in tanks, tankless units and fixtures.
• Gaithersburg, MD: At about 154 mg/L, scale builds in water heaters and on fixtures.
• Lake Elsinore, CA: Minerals from imported water coat heating elements, shower valves and faucet cartridges.
• Lubbock, TX: At about 10 grains per gallon on average, scale builds in water heaters and clogs aerators and shower heads.
• Henderson, NV: Scale builds quickly in water heaters, tankless units, faucets and shower valves.
• Shakopee, MN: At 21 grains, scale builds quickly in heaters, humidifiers, faucets and valves.

Before the Plumber Arrives

• Photograph the handle and trim; the brand logo helps identify parts.
• Check for an access panel on the other side of the shower wall.

Other Faucet & Fixture Repair Services

• Garbage Disposal Repair

Shower Valve Questions