Built-in dishwasher with the door open and racks pulled out

Generic photo: Castorly Stock · Pexels License

DishDrawer F1: water in base / flood

F1 means the flood sensor found water. Separate foam problems from real leaks before taking anything apart. Real leaks on older units usually come from cracked drain hoses or a lid that is not sealing.

Single source ~60 min moderateBrands: Fisher & Paykel

Before you start

If water is on the floor, isolate power at the wall and turn off the water first.

Diagnostic steps

Unlock all 5 steps with expected values

Full library + AI assistant for $34.90, one time.

Get lifetime access

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

More dishwashers guides

Component test · Dishwasher

How to test a dishwasher heating element

Many US dishwashers have a hidden or visible loop element under the tub. A good one reads in the tens of ohms. A leak to the tub trips the GFCI even when the resistance looks fine, so always check to ground.

5 steps ~20 mineasy

Component test · Dishwasher

How to test a dishwasher circulation (wash) pump motor

The wash motor pushes water to the spray arms. Older units use an AC induction motor; many newer ones use a brushless DC motor driven by the board. Rule out a jam and a filter clog before testing, and use the tech sheet for winding values.

6 steps ~45 minmoderate

Component test · Dishwasher

How to test a float switch (dishwasher overfill and similar)

A float rides up with water and opens or closes a small switch under the tub. It stops overfill or flags a leak. Make sure the float moves freely before blaming the switch.

6 steps ~20 mineasy