Waste pipe won't drain water
Hello,
I have brought a new washing machine for my new build house.
I have installed it but it's not draining. I believe I have located the problem to the connection under my sink.
The pump works because when I push the black piece that's inside the waste pipe in when it's draining water squirts out it's just not doing it on the connection I can't hear anything.
Do any of you know how to resolve this ?
Many thanks in advance
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
New washing machine would not drain through sink waste connection
- The problem
- A newly installed washing machine in a new-build house would not drain. The owner reported that the pump appeared to work because water squirted out when a black piece inside the waste connection was pushed, but it would not discharge normally into the sink waste spigot.
- Likely cause
- Most likely the sink trap/waste spigot was still sealed with a factory blanking plug, or there was an insert/flap or other obstruction in the waste connection preventing the pump from discharging. The discussion supported the waste connection as the probable issue rather than a fault in the washing machine itself.
- What fixed it
- Check the sink waste spigot for a factory blanking plug and inspect the black insert/flap for incorrect fitting or obstruction. Also ensure the drain hose is fully fitted to the spigot and not kinked or routed too high. The thread was marked solved, but no final post confirmed exactly which repair was carried out.
- Checks to try
- Pump operation was inferred because water squirted out when the black piece inside the waste pipe was pushed during draining.
- Sink waste spigot/connection under the sink was identified as the likely restriction.
- Check for a factory-sealed blanking plug in the sink trap spigot.
- Inspect the black insert/flap inside the spigot for sticking, wrong fitment or obstruction.
- Check the drain hose is fully pushed onto the spigot and secured.
- Check for a kinked or crushed drain hose.
- Check the drain hose height is not too high.
- Check whether the sink trap or waste is partially blocked.
Safety: Isolate the appliance from the mains before checking the waste connection. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
It does sound very likely to be the sink waste connection rather than the washing machine itself.
Before checking anything, isolate the appliance from the mains.
1. Check for a blanking plug in the sink spigot On many new sink traps, the washing machine hose connects to a side spigot that is factory sealed. If this blanking piece hasn’t been knocked or cut out, the machine cannot pump into it. This is the most common cause on a new installation.
2. Check the “black piece” you mentioned If you mean a non-return flap or insert inside the spigot, it may be stuck, fitted wrongly, or not opening properly under pump pressure. Remove the hose and inspect the spigot carefully for any insert, cap, or obstruction.
3. Check the drain hose connection Make sure the hose is pushed fully onto the spigot and secured with a proper hose clip. If it’s only partly fitted, it can restrict flow.
4. Check for a kink or height issue The drain hose must not be kinked or crushed behind the machine. Also make sure it isn’t routed too high above the manufacturer’s recommended drain height.
5. Test the sink waste itself If the trap or waste under the sink is partially blocked, the washing machine may struggle to discharge properly.
If this is a brand new house, it would not be unusual for the trap connection to have been left sealed. If you’re unsure, a plumber can confirm it quickly. For any internal electrical work, use a qualified engineer.
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This answer was generated automatically by the WhitegoodsHelp AI Assistant. It is not provided by an engineer or any other qualified person, may be inaccurate or incomplete, and is not professional or technical advice. Do not rely on it. Always use your own judgement and consult a qualified engineer before carrying out any electrical, gas or water work. Use is entirely at your own risk. See our full Terms of Use.
SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
Know your limits
If you are not confident testing or working inside the appliance, stop and call a professional.
AI guidance, not guaranteed
This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
This is general information only and is not professional advice. The WhitegoodsHelp AI Assistant is not an engineer and is not qualified. See our full Terms of Use.
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