A leaking washing machine inlet hose is one of the more common household plumbing nuisances, and the good news is that most homeowners can fix it themselves without calling a tradesperson. The leak is almost always caused by a worn washer, a loose connection, or a damaged hose — all straightforward to address with basic tools and a trip to your local hardware store.
Understanding the Inlet Hose Setup
Your washing machine typically has two inlet hoses — one for hot water and one for cold — running from the back of the machine to isolating tap valves (also called tap connectors) on the wall. Each hose has a threaded fitting at both ends, and a small rubber washer inside each fitting creates a watertight seal. Over time, these washers harden, crack, or deform, causing drips or steady leaks.
Before you start any work, turn off the isolating taps supplying the washing machine. If your laundry doesn't have isolating taps, turn off the water at the toby (main stopcock), usually located near the boundary or under the kitchen sink. This is an important safety step — water damage can be costly and can contribute to mould issues that affect your home's compliance with Healthy Homes standards.
Tools and Materials You'll Need
- Adjustable spanner or slip-joint pliers
- Towels or a small bucket
- Replacement rubber washers (check your hose fittings for the correct washer size — take the old washer to the hardware store to match it)
- PTFE (Teflon) tape
- Replacement inlet hose (if the existing hose is cracked or bulging)
Replacement hoses and washers are readily available at Bunnings or Mitre 10. Braided stainless steel hoses are worth the small extra cost — they're far more durable than standard rubber hoses and less likely to burst.
Step-by-Step: Fixing the Leak
Step 1 — Identify where the leak is coming from
Dry the hose and fittings with a towel, then turn the water back on briefly to watch exactly where the drip originates. Common spots are:
- The wall tap connection (where the hose screws onto the isolating valve)
- The machine inlet connection (where the hose screws into the back of the washing machine)
- Along the body of the hose itself (a crack or blister)
Step 2 — Turn off the water and disconnect the hose
With the taps off, unscrew the leaking hose fitting by hand or with an adjustable spanner. Have a towel ready — some water will spill out. Inspect the rubber washer inside the fitting.
Step 3 — Replace the washer
Pop out the old washer with a flat-head screwdriver and press a new one firmly into the recess. This is the most common fix and often all that's needed. If the fitting threads look worn or corroded, wrapping 2–3 layers of PTFE tape clockwise around the male thread before reconnecting can help create a better seal.
Step 4 — Reconnect and test
Hand-tighten the fitting first, then snug it up with a spanner — do not overtighten, as this can crack the fitting or damage the washer. Turn the water back on slowly and check for drips. Run a short wash cycle and inspect again.
Step 5 — Replace the hose if damaged
If the hose body is cracked, blistered, or older than 5–7 years, replace the whole hose rather than just the washer. A burst hose can cause significant flooding. When fitting a new hose, ensure the washers are seated correctly in both end fittings before tightening.
Preventing Future Leaks
- Check hoses annually for signs of wear, cracking, or bulging.
- Don't leave the isolating taps fully open when the machine isn't in use — this keeps the hoses under constant pressure.
- Consider upgrading to braided stainless steel hoses for greater peace of mind.
- Make sure your laundry has a floor waste drain — check with your local council and designer, as floor waste requirements for new laundry installations may apply under the NZ Building Code and helps limit damage if a hose does fail.
Is This Restricted Plumbing Work?
Replacing or reconnecting a washing machine inlet hose at the machine end is generally considered maintenance that a homeowner can do themselves. However, any work on the fixed pipework or wall valves — such as replacing an isolating tap or extending pipework — is restricted plumbing work under the Plumbers, Gasfitters and Drainlayers Act 2006. This work must be carried out by a licensed plumber registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB). Doing restricted work yourself is illegal and can void your home insurance.
If you're unsure whether your repair crosses into restricted work territory, it's always best to check with a licensed plumber.
When to Call a Professional
Call a licensed plumber if:
- The isolating tap itself is leaking or needs replacing
- There is water damage to walls, flooring, or cabinetry that needs assessment
- You notice low water pressure or discoloured water suggesting a broader pipe issue
- You're not confident working around plumbing fittings
- The leak is coming from inside the wall
You can find qualified local plumbers on tradedirectory.co.nz to get the job sorted quickly and correctly.
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