What's going on
A floor leak sensor sounds its alarm when water bridges its contacts. It can't tell you where the water came from. In apartments that matters, because a small drip in your laundry closet can turn into a stain on your downstairs neighbor's ceiling. Some buildings also add drain pans under washers or install valves that shut the water off when a leak is detected.
The usual sources are a fill hose or connection weeping at the wall, the drain hose overflowing the standpipe while the washer pumps out, the door seal or detergent drawer leaking on a front-loader, and too much detergent foaming over. In humid summer weather, cold water pipes can also sweat and drip onto a sensor, which can look like a leak when the washer isn't the cause at all.
What you can check in five minutes
- Turn off the water valves behind the washer and unplug the washer if the floor around it is dry enough to reach the plug safely.
- Dry the sensor and the floor completely, then watch to see where new water shows up.
- Run your hand along both fill hoses and their connections, at the wall and at the washer.
- Run a rinse cycle and watch the drain hose during the pump-out. Water rising out of the standpipe means a drain problem.
- On a front-loader, check the bottom of the door seal and the detergent drawer for drips.
- Feel the cold water pipes nearby for beads of condensation.
Rent, own or co-op: who handles it?
If water could be reaching the unit below, tell the super or managing agent right away, even if you think you found the cause. Some co-op and condo boards set rules for in-unit washers, such as requiring pans, leak detectors or specific hoses. Check your lease or ask your building what your setup needs to include.
What a technician will look at
- •The inlet valve and the hose connections
- •The pump, internal hoses and tub seal
- •The door seal and detergent dispenser housing
- •How the drain hose sits in the standpipe and how much water it pumps out
- •Whether the leak happens during fill, wash or spin
Andre's field note: I treat every leak alarm as real until I've proven otherwise, because the floor below someone else's apartment isn't a place to experiment. We see these calls in buildings of every age, from prewar walk-ups to newer towers in Astoria and Long Island City. Leaks and vibration often show up together, so if you also have a washer that shakes, sort that out next.
Alarm still sounding? Call ProFix NYC at (929) 699-8358.