FHB Logo Facebook LinkedIn Email Pinterest Twitter X Instagram Tiktok YouTube Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Restoration
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Fine Homebuilding Project Guides

Plumbing

Guide Home
  • Plumbing Basics
  • Bathrooms
  • Kitchens
  • Roughing In
  • Water Heaters, Washers, and More
  • Maintenance and Repair
Ask the Experts

No Water From a New Mixing Valve

Avoid this common but easily solved mistake when testing a newly installed mixing valve in a tub or shower.

By Mike Guertin Issue 302 - October 2021
  • X
  • facebook
  • linkedin
  • pinterest
  • email
  • add to favorites Log in or Sign up to save your favorite articles
Most modern mixing valves are pressure balancing valves, which should be a clue as to why no water came out when this homeowner opened just the cold-water supply valve.

I installed a new mixing valve in my tub/ shower and it doesn’t seem to work. I followed the instructions and piped in the supply lines, the tub spout, and the shower-head fitting. When done, I opened the cold-water shutoff valve to check for leaks and there were none. Then I opened the mixing valve and only a little water dribbled out. I turned the flow-diverter valve and the temperature-mixing valve in all directions and still no water.

Figuring I did something wrong or got some debris in the mixing valve, I removed the cartridge from the body—everything looked clean. After putting everything back together, I tried opening the hot-water shutoff to check for leaks and to see if water would flow through the valve. No leaks there, so I opened the mixing valve and the same thing happened as when I turned on the cold water—only a dribble came out. Could the valve be defective or is there something I may be missing?

—Harold Klempner via email

Editorial Advisor Mike Guertin replies: I had this same mixing-valve problem skunk me years ago in my own house, and I asked a plumber friend about it when he came by to borrow some tools. “You should have hired a professional,” he said, laughing. He opened both the hot- and cold-water-supply valves, then turned on the mixing valve, and water magically flowed. He laughed at me and my bewildered expression. “It’s a pressure-balancing valve; you have to open both hot- and cold-supply valves in order for the water to flow through the valve.” As soon as he said that, it made perfect sense.

The internal mechanism that balances the flow of hot and cold water through the valve did its job. A pressure-balancing mixing valve automatically adjusts the flow of hot or cold water through the valve to compensate for a change in pressure of the other one. If someone else flushes a toilet while you’re taking a shower with a direct-flow valve, the pressure in the cold water line may drop and you get a shock of hot water. Pressure-balancing valves prevent this by maintaining the temperature you adjusted the water to when you got in the shower.

When you turned on the cold water while the hot water was shut off, the valve automatically shunted the cold water because there was no pressure on the hot side of the valve. The valve needed both hot and cold supplies to be open in order to let water pass through freely.

From Fine Homebuilding #302


RELATED LINKS

  • Shutoff That Won’t Shut Off
  • Three Ways to Waterproof Tile Showers
  • Eliminating Water Hammer
Previous: Replace a Shower Mixing Valve Next: Improving Water Pressure

Guide

Plumbing

Chapter

Maintenance and Repair

Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Plumbing

Plumbing

Trusted, comprehensive guidance from the pros for tackling any plumbing project

View Project Guide

View All Project Guides »

Become a member and get unlimited site access, including the Plumbing Project Guide.

Start Free Trial

Plumbing Basics
  • Plumbing Systems
  • Materials
  • Plumbing Tools
Bathrooms
  • Sinks
  • Showers & Tubs
  • Toilets
Kitchens
  • Kitchen Sinks
  • Water Filtration
  • Appliances
Roughing In
  • Layout
  • Installation
  • Copper Pipe
  • PEX Tubing
  • PVC Drainpipe
Water Heaters, Washers, and More
  • Water Heaters
  • Whole-House Filters
  • Sump Pumps
  • Washers
  • Sprinkler Systems
Maintenance and Repair
  • Sinks
  • Toilets
  • Showers & Tubs
  • Systems

Fine Home Building

Newsletter Sign-up

  • Fine Homebuilding

    Home building tips, offers, and expert advice in your inbox.

  • Green Building Advisor

    Building science and energy efficiency advice, plus special offers, in your inbox.

  • Old House Journal

    Repair, renovation, and restoration tips, plus special offers, in your inbox.

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters

Follow

  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X
  • Fine Homebuilding

    Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.

    Start Free Trial Now
    • Facebook
    • Instagram
    • X
    • LinkedIn
  • GBA Prime

    Get instant access to the latest developments in green building, research, and reports from the field.

    Start Free Trial Now
    • Facebook
    • YouTube
  • Old House Journal

    Learn how to restore, repair, update, and decorate your home.

    Subscribe Now
    • Facebook
    • Instagram
    • X

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences
  • About
  • Contact
  • Advertise
  • Careers
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2025 Active Interest Media. All rights reserved.

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

  • Home Group
  • Antique Trader
  • Arts & Crafts Homes
  • Bank Note Reporter
  • Cabin Life
  • Cuisine at Home
  • Fine Gardening
  • Fine Woodworking
  • Green Building Advisor
  • Garden Gate
  • Horticulture
  • Keep Craft Alive
  • Log Home Living
  • Military Trader/Vehicles
  • Numismatic News
  • Numismaster
  • Old Cars Weekly
  • Old House Journal
  • Period Homes
  • Popular Woodworking
  • Script
  • ShopNotes
  • Sports Collectors Digest
  • Threads
  • Timber Home Living
  • Traditional Building
  • Woodsmith
  • World Coin News
  • Writer's Digest
Active Interest Media logo
X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Project Guides
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Online Learning

  • Courses
  • Project Guides
  • Reader Projects
  • Podcast

More

  • FHB Ambassadors
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • X
  • YouTube
  • instagram
  • facebook
  • pinterest
  • Tiktok

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in

Privacy Policy Update

We use cookies, pixels, script and other tracking technologies to analyze and improve our service, to improve and personalize content, and for advertising to you. We also share information about your use of our site with third-party social media, advertising and analytics partners. You can view our Privacy Policy here and our Terms of Use here.

Cookies

Analytics

These cookies help us track site metrics to improve our sites and provide a better user experience.

Advertising/Social Media

These cookies are used to serve advertisements aligned with your interests.

Essential

These cookies are required to provide basic functions like page navigation and access to secure areas of the website.

Delete My Data

Delete all cookies and associated data