Bosch Dishwasher Overflowing — Solved

Bosch has two layers of flood defense#

Bosch fill control is deliberately over-built. The AquaStop supply hose contains an electrically controlled shutoff valve that only opens when the control module commands it and springs closed on any power loss. Downstream, a dual-solenoid inlet valve meters water into the tub, a flow meter counts the water entering, and an anti-flood float switch in the base physically rises if the level climbs too high. Because of that layering, a true floor flood is rare — the machine usually stops itself and shows a code first.

When water does escape, it is almost always because one component failed in a way the backups could not fully cover: an inlet valve stuck open, a mis-reading flow meter, or a float that did not rise. Reading the code tells you which layer reacted, and that narrows the failed part quickly.

Causes ranked by likelihood#

Check it yourself, in order#

1. Cut power and water before opening anything; keep towels ready for water held in the tub or base pan.
2. Read the code: E17 is a high tub level, E15 is an AquaStop leak trip, and E14 points at the flow meter.
3. Tip the machine gently to check whether the base-pan float has risen and latched the AquaStop closed.
4. Inspect the inlet valve for a stuck-open solenoid — a valve that will not fully close is the most common overfill cause.
5. Check the flow meter for debris or a wiring fault that would let the board lose its water count.
6. The valve and pump covers use T20 Torx screws if you go in for a replacement.

Prevent the repeat#

Because the AquaStop valve fails safe by closing on power loss, leaving the [dishwasher](/blog/repair-or-replace-dishwasher) plugged in and its water supply on keeps the protection armed between cycles. Periodically clearing sediment from the inlet screen also keeps the valve seating fully, which is what prevents the slow overfill that a failing valve produces. It is worth knowing that a Bosch showing E15 has already shut its own supply as designed, so the priority is finding the leak that filled the base pan rather than the fill valve itself. Catching a minor drip early keeps it from ever reaching the anti-flood float.

Repair or replace?#

An inlet valve, a flow meter, or a float is an inexpensive part, so an overfill fault rarely justifies replacing a Bosch. A repeat AquaStop or control fault on an older machine is where a repair-or-replace decision belongs. A technician can read the code and confirm the failed layer in one visit. Book a diagnosis for an upfront quote.