Sink water gushing back into washing machine

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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