Quick answer
Water behind a washing machine is almost always the inlet hose, the outlet hose slipping out of the stand-pipe, or the cold inlet valve dripping. Inlet hoses are rubber and perish, and because they sit under full mains pressure at all times, a failed one does not drip — it sprays. Replacing them every five years is the cheapest insurance in the house.
Common causes
- Perished or bulging rubber inlet hose under constant mains pressure
- Outlet hose worked loose from the stand-pipe during the spin cycle
- Failed or weeping cold inlet valve on the wall
- Machine's internal pump or door seal leaking
- Blocked stand-pipe backing waste water up and over
- Over-foaming from too much detergent forcing water past the door seal
What you can do now
- 1Pull the machine out and identify whether the water is clean supply or grey waste — that halves the diagnosis
- 2Check the inlet hoses for bulging, crazing or damp at the couplings
- 3Make sure the outlet hose is properly secured into the stand-pipe and cannot jump out
- 4Close the inlet tap when the machine is not in use if a hose looks marginal
- 5Replace inlet hoses every five years as routine, before they fail
When to call a professional
Call a plumber if the leak is from the wall stop-tap, the stand-pipe or the pipework rather than the machine itself, and call sooner if the stand-pipe backs up, since that is a drain blockage rather than an appliance fault. A burst inlet hose under mains pressure can put out hundreds of litres before anyone notices, so treat a bulging hose as urgent.
Typical cost in Johannesburg
Hose replacement R250–R450 · Valve replacement R650
Indicative ranges only. We provide written, itemised quotes before any work.
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