Water entering an idle washer points to a supply-valve or inlet-valve problem, not a cycle setting. Close both wall valves to stop the flow and identify whether the water is clean supply water or drain backflow. Close both supply valves and see whether the water stops.
What this covers
- Washing machines · inlet system
What it does not cover
Differential
Likely causes of “Why does a washing machine fill with water while it is turned off?”, and how to tell them apart
- 1
An inlet valve is leaking water past its seal
What separates it Clean water enters while the washer is off with the wall valves open, and the water stops when the valves are closed.
How to confirm Close both supply valves and see whether the water stops.
- 2
Backflow from the drain is entering the drum
What separates it The water is dirty or smells of the drain, and the drain hose is too low or has no air gap.
How to confirm Check the water's clarity and the drain installation.
- 3
A water hammer or supply pressure spike is pushing water through
What separates it A small amount of water enters after a tap nearby is shut off and the pressure is high.
How to confirm Note the timing relative to other taps in the house.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the water is clean or dirty and how quickly it enters.
- Whether it enters with the wall valves open and the washer off.
- Whether closing both valves stops it.
Try in this order
0 of 4 completedObserve before changing anything
ReversibleNote whether the water is clean and whether it enters with the wall valves open but the washer powered off.
Isolate the failing boundary
ReversibleClose both supply valves. If water stops, the inlet path is implicated; if dirty water appears from the drain side, inspect drain installation and household plumbing.
Apply the narrow correction
ReversibleLeave the supply valves closed between uses and arrange the exact-model inlet-valve or plumbing repair.
Verify the result and stop at the boundary
ReversibleStop immediately if water threatens electrical parts or continues with both household valves closed.
Stop boundary
When this stops being a self-service repair
- !Stop immediately if water threatens electrical parts or continues with both household valves closed.
- !Leave the supply valves closed between uses until the inlet valve or plumbing is repaired.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Is it safe to leave the taps on behind a washer?+
Many manufacturers advise closing them when the machine is not in use, because a failing valve can flood the room.
Should I replace the hoses as well?+
Replace fill hoses at the interval your manual or the hose maker gives, commonly every few years, because a split hose is the other common cause of a flooded laundry room.
Why fills when off?+
A leaking inlet valve.
Who should fix it?+
A technician.