How to Unclog Bosch Dishwasher: E24 and E25 Fixes

Before you touch anything: cancel the cycle by holding Start/Reset for 3-5 seconds, give the drain pump 2 minutes to stop, then switch off the breaker. Open the door gently — standing water above the seal line comes forward.

Tools: a Torx T20 screwdriver, a flat-head screwdriver, towels, a shallow pan, and a wet/dry vacuum if you have one.

Clear the water, then the filter#

Sponge, mop or vacuum the tub floor until the sump is reachable; a shallow baking dish dragged along the floor scoops the last of it toward you.

The triple-filter sits centre-bottom. Grip the cylindrical mesh handle, turn a quarter turn counterclockwise following the moulded arrow, and lift it straight out, then lift out the flat fine filter around it. Grease and food packed into that mesh is the single most common cause of slow draining. Hot water and a soft brush, and it goes back looking new.

Into the pump chamber#

Look down the sump opening with the filter out and you will see the drain pump cover — a round or rectangular plastic cap that snaps off, or comes away with one Torx T20 screw on 300, 500 and 800 series machines. Go carefully here: broken glass collects in this chamber.

Shine a torch on the impeller. Fruit pits, small bones, glass shards, toothpicks and jar labels are the usual finds, and tweezers or needle-nose pliers lift them out. Then turn the impeller with a fingertip. It should spin freely both ways. Gritty or stuck means something is lodged behind it.

Following the hose#

Filter clean, impeller free, still no drainage? The blockage is downstream. Take the kick plate off — 2 Torx T20 screws on most models, squeeze-tab clips on older ones — and find the ribbed hose leaving the pump outlet toward the sink cabinet. Check for a kink first, because the hose gets pinched whenever the machine is pushed back under the counter.

To clear it, put towels down, squeeze the spring clamp back with pliers and pull the hose off the outlet, with the pan ready for what comes out. Look through it toward a torch. The first bend after the pump is where blockages settle. Flush from the sink end or run a long flexible brush through.

Under the sink, check where the hose meets the disposal or the tailpiece. If it feeds a disposal, confirm the knockout plug was actually removed at installation — that omission causes chronic drainage complaints. Confirm the high loop while you are down there: the hose has to rise to the underside of the counter before dropping to the drain, or sink water siphons back into your dishwasher.

Reading the code#

Timing narrows it further. E24 back within 30 seconds of a new cycle means the hose or sink connection. E24 that takes 5-10 minutes to appear means a pump that is working but struggling, which is usually an obstruction at the impeller.

Putting it back and keeping it clear#

Push the hose on firmly and slide the clamp home, refit the kick plate, then the pump cover, the fine filter and the mesh filter last — a quarter turn clockwise until the arrow lines up with the padlock icon. Run a rinse cycle and check the sump afterwards; a thin film of water is normal and keeps the pump seal from drying out.

Then keep it clear: scrape plates rather than rinsing, clean the triple-filter every 4-6 weeks, run the disposal beforehand, use a hot or sanitize cycle monthly to melt grease out of the drain path, and keep paper labels out of the machine.

A cracked impeller, an E24 that survives a clean pump and hose (meter the pump terminals — 150-250 ohms is healthy), or water at the base tripping AquaStop all mean the pump or a seal, not a clog. Book a repair and we will bring the pump.