Bosch dishwashers are built a little differently from many American brands, and several of the things owners call about are really those differences showing through. The machine is quieter because it's insulated and runs its pump gently. It's efficient because it uses less water and doesn't bake dishes dry with an exposed heating element. And it protects your floor with a safety switch that can shut it down when it senses water where water shouldn't be.
Once you know how a Bosch thinks, its codes and quirks make more sense.
How a Bosch dishwasher is built
- •A hidden heater. Instead of a coil in the tub, most Bosch models heat water in a heater built into the circulation pump or water path. Nothing glows in the bottom of the tub.
- •Condensation drying. At the end of the cycle, the hot stainless tub walls stay warm while the water on dishes cools and condenses onto the cooler surfaces, then runs down to drain. Some upper-series models add a mineral (zeolite) that releases heat as it absorbs moisture, marketed as CrystalDry.
- •A base pan with a float switch. Under the tub is a sealed pan. If water collects there, a float rises and trips a switch, the machine stops, and the drain pump runs to protect the floor. That's the E15 code.
- •A manual filter. The filter assembly in the tub floor has to be cleaned by hand. It doesn't grind food away.
Plastics still wet after the cycle
Owners raise this one a lot, and usually it is not a fault. Condensation drying relies on the dishes holding heat. Glass and ceramic do. Plastic doesn't, so water beads on containers and stays there.
What helps:
- Use rinse aid, always. It lets water sheet off instead of beading. On a Bosch, rinse aid is part of the drying system, not an extra. Many models also let you raise the rinse aid dosage in the settings.
- Pick a drying option if your model has one: Extra Dry, Sanitize or a heated final rinse makes a noticeable difference.
- Load plastics on the top rack, tilted so water runs off, and unload the bottom rack first so the top doesn't drip onto it.
- Crack the door once the cycle ends, if your model doesn't do it automatically, so the remaining steam escapes.
When wet dishes point to a fault
If ceramic plates and glasses come out wet and cool, or the tub isn't warm when a normal cycle finishes, the water isn't getting hot. That's the heater circuit, a temperature sensor or the control. It's worth a diagnosis, because a dishwasher that doesn't heat also doesn't clean well.
E15: water in the base
E15 means the float switch in the base pan has tripped. The dishwasher usually stops and runs its drain pump, and the code won't clear until the base is dry.
Common sources of that water:
- •Suds. Hand dishwashing liquid, or plates pre-rinsed with it, foams over and finds its way into the base. It's a frequent cause of E15.
- •A leak from the door gasket or the tub.
- •A loose or cracked hose inside the cabinet.
- •A leaking pump or heater seal.
Getting the water out of the pan sometimes means sliding the dishwasher out and tilting it, which disturbs the installation. A technician can locate the leak source, not just dry out the pan, so it doesn't happen again.
E24 and E25: drain problems
- •E24 usually means the machine couldn't pump water out, often because of a kinked drain hose, a clogged garbage disposal connection, or a freshly installed disposal whose dishwasher port was never opened.
- •E25 usually means the drain pump itself is blocked. Under the filter assembly, there's a small cover (often a white or clear clip) over the pump. With the power off, clean the filter, remove the cover and look for glass, cherry pits, bits of label or a seed. Clear it carefully, since glass is common.
On some models E22 points to a clogged filter, and E09 to the heater circuit. Codes differ between model generations, so use your manual's list.
A Bosch that won't start
- •Control lock. Many models lock the buttons when a certain button is held; your manual shows which.
- •Door closure. Bosch doors need to latch fully. A dishwasher installed in a panel-ready configuration, with a heavy custom cabinet front, may need its door springs adjusted so the door closes and stays shut.
- •Remote start. On Home Connect models, a cycle may be waiting for remote start from the app.
- •Power. Check the breaker and any GFCI outlet under the sink.
If it still won't start, the latch switch or the control are the next suspects.
Things worth knowing
- •The InfoLight (a red dot projected on the floor on some models) means the cycle is still running. It isn't a fault.
- •Clean the filter monthly. It's the single most useful habit for a Bosch.
- •Mineral film on glasses is a water chemistry issue, not a Bosch fault. WSSC Water, like any supply, leaves deposits over time. Our general dishwasher guide covers how to tell film from etching.
When to call
Book a visit when E15 comes back after the base has dried and you've ruled out suds, when E24 or E25 keeps reappearing even with a spotless filter and pump cover, or when the dishwasher doesn't heat. The goal of the visit is the cause, not a cleared code: the technician tracks down the leak, clog or heating fault, tells you what it is and what the fix costs, and you decide. We have no factory tie to Bosch, so if the machine is still inside Bosch's coverage, start with Bosch.
More is on our Bosch dishwasher repair page. Call or book online.