Sink water gushing back into washing machine
My washing machine's waste pipe doesn't seem to be long enough. It sort of droops downwards when attached to the sink and the sink water returns back into the washing machine now and then. Is there any way to fix this? Would a extension pipe fix the issue? Also, is it normal for this to happen when the pipe is placed downwards rather than upwards?
Thanks!
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.
Sink waste water backing into washing machine due to drain hose layout
- The problem
- Sink water was returning into the washing machine because the waste hose was drooping downwards and appeared too short when connected to the sink waste.
- Likely cause
- Most strongly supported diagnosis is incorrect drain hose installation. The hose likely needs to rise in a high loop before entering the sink waste, and backflow may also be worsened if the sink trap or waste is partially blocked. The exact plumbing fault was not independently confirmed.
- What fixed it
- Route the washing machine drain hose upwards to the correct height before it enters the sink waste or standpipe, and secure it properly. A hose extension may help only if it allows the hose to be installed in the correct high loop; a proper drain hose extension/joiner kit was suggested rather than an improvised arrangement. If the sink waste drains slowly, clear the trap and waste pipe. The exact repair was not confirmed in the thread.
- Checks to try
- Check the drain hose height and whether it rises before entering the waste
- Check how the hose connects to the sink waste/spigot
- Inspect whether the sink trap or waste pipe is partially blocked or draining slowly
- Parts or tools mentioned
- Washing machine drain hose extension/joiner kit
Safety: Isolate the appliance from the mains before moving it or inspecting connections. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
What you’re describing is usually a drain hose installation issue rather than a fault with the washing machine itself. Yes, if the hose drops too low or is pushed into the waste incorrectly, sink water can run back towards the machine.
1. Check the drain hose height The washing machine drain hose normally needs to rise up to a proper “high loop” before it enters the sink waste or standpipe. If it droops downwards first, water can flow back. Most machines want the hose outlet around 60–100 cm from floor level, but check your instruction book if possible.
2. Look at how it connects to the sink waste If it’s connected to a spigot on the sink trap, the hose should be secured firmly and routed upwards first. If it’s simply pushed down somewhere awkwardly, that can definitely cause backflow.
3. Inspect the sink waste for partial blockage A slow or blocked sink trap can force water back into the washing machine hose. If the sink is draining slowly, clear the trap and waste pipe first.
4. Would an extension help? Possibly, but only if it allows you to route the hose correctly in a high loop. Don’t make it excessively long, as that can affect draining. A proper washing machine drain hose extension/joiner kit is better than an improvised fix.
5. Check for a non-return issue Washing machines rely partly on correct hose positioning to prevent syphoning and backflow. It is not really normal for sink water to gush back in, so the hose layout or plumbing arrangement needs correcting.
Isolate the appliance from the mains before moving it or inspecting connections. If the waste plumbing needs altering, or you’re unsure, it would be sensible to get a qualified engineer or plumber to sort it properly.
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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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