How to Replace Leaky Washing Machine Water Supply Lines: A Step-by-Step Guide

Updated at: 20/05/2025

A leaky washing machine water supply line is more than just an annoying drip; it's a potential source of significant water damage and wasted resources. Ignoring a persistent leak can lead to costly repairs, not to mention the inconvenience of a flooded laundry room. Beyond the immediate issues, a failing supply line poses a safety risk, potentially causing electrical hazards if water comes into contact with wiring. This is particularly crucial given the often-damp environment surrounding a washing machine. Fortunately, replacing these lines is a manageable DIY project for most homeowners with basic plumbing skills.

This guide provides a comprehensive, step-by-step process for safely replacing your washing machine's water supply lines, eliminating those troublesome leaks and ensuring peace of mind. We'll walk you through each stage, from turning off the water supply to properly connecting the new lines, ensuring you have everything you need to tackle this repair confidently. Let's get started!

Preparation and Safety Guidelines

Tools Needed
  • Channel-lock pliers
  • Towel or washcloth
  • New washing machine hoses (with washers)
  • Possibly Isetta pliers
Safety Guidelines
  • Always turn off the water supply to the washing machine at the shut-off valves BEFORE starting any work. Failure to do so could result in flooding.
  • Use only braided stainless steel supply lines rated for cold and hot water. Avoid using rubber or plastic hoses, as they are prone to cracking and leaking.
  • If you are uncomfortable performing this repair yourself, contact a qualified plumber. Improper installation can lead to water damage and safety hazards.

Step-by-Step Instructions

  1. Turn Off Water Supply

    • Shut off the water supply to the washing machine. If you don't have individual valves, shut off the main water supply to the house.
    Shut off the water supply to the washing machine. If you don't have individual valves, shut off the main water supply to the house.
    Turn Off Water Supply

  2. Disconnect Old Hoses

    • Loosen the old hoses using channel-lock pliers if necessary. Turn counter-clockwise to loosen.
    • Remove the old hoses from the back of the washing machine. Be prepared for some water leakage.
    Remove the old hoses from the back of the washing machine. Be prepared for some water leakage.Remove the old hoses from the back of the washing machine. Be prepared for some water leakage.
    Disconnect Old Hoses

  3. Prepare for New Hoses

    • Clean the surfaces of the fittings on the washing machine with a clean towel or washcloth.
    • Install washers onto the ends of the new hoses.
    Install washers onto the ends of the new hoses.Install washers onto the ends of the new hoses.
    Prepare for New Hoses

  4. Connect New Hoses

    • Hand-tighten the new hoses onto the back of the washing machine and the fill valve.
    • Tighten the hoses further using channel-lock pliers if necessary, ensuring they are snug (about a half-turn after snug).
    Tighten the hoses further using channel-lock pliers if necessary, ensuring they are snug (about a half-turn after snug).Tighten the hoses further using channel-lock pliers if necessary, ensuring they are snug (about a half-turn after snug).
    Connect New Hoses

  5. Test for Leaks

    • Turn the water back on and check for leaks. Tighten further if leaks persist.
    • Run a wash cycle to double-check for leaks.
    Run a wash cycle to double-check for leaks.Run a wash cycle to double-check for leaks.
    Test for Leaks

Read more: Fixing a Leaky Toilet Tank: A Step-by-Step Guide

Tips

  • Identify hot and cold water hoses correctly; they are usually labeled on the back of the washing machine.
  • Use a towel or washcloth to absorb any water that leaks out during hose removal and installation.
  • Ensure the new hoses correspond to the hot and cold ports on the back of the washing machine.

Common Mistakes to Avoid

1. Overtightening the Compression Fittings

Reason: Overtightening can damage the compression nut, the valve, or the supply line itself, leading to leaks or even breakage.
Solution: Tighten the compression fittings only until snug; avoid using excessive force.

2. Ignoring Old or Damaged Supply Lines

Reason: Using old, brittle, or kinked supply lines increases the risk of leaks and failures, potentially causing water damage.
Solution: Replace the supply lines completely, even if they appear to be only slightly damaged.

3. Forgetting to Turn Off the Water Supply

Reason: Failing to turn off the water supply before disconnecting the lines can lead to a significant water leak and potential flooding.
Solution: Always turn off the water supply valves to both the hot and cold water lines before beginning any work.

FAQs

What type of water supply lines should I use to replace my old ones?
Use braided stainless steel supply lines. They're more durable and less prone to leaks than rubber hoses, offering a much longer lifespan and better protection against bursting.
Do I need any special tools to replace the water supply lines?
You'll primarily need adjustable pliers or a basin wrench to loosen and tighten the connections. A bucket to catch any remaining water is also helpful. Beyond that, basic hand tools will suffice.