Bosch E25 – Drain Pump Blocked

Check and clear the drain pump impeller

Remove the drain filter assembly. Below the coarse filter there is a small cover or access point to the drain pump impeller. Insert a flat screwdriver and try to rotate the impeller — it should turn freely. Remove any visible debris. Many E25 errors are resolved this way without replacing the pump.

Tools needed: Flat screwdriver, Gloves, Flashlight

Check the drain hose

Locate the drain hose at the back of the appliance. Make sure it is not kinked, clogged, or pushed too far into the standpipe. The hose end should be no more than 6 inches into the pipe.

Clean the drain pump filter

On front-loaders, open the small access door at the bottom front. Place a towel and shallow pan underneath, unscrew the filter cap slowly, and let water drain. Remove any lint, coins, or debris from the filter cavity. Rinse the filter under running water.

Tools needed: Towel, Shallow pan

Inspect the pump impeller

With the filter removed, shine a flashlight into the pump housing and rotate the impeller (small plastic propeller) by hand. It should spin freely. If it is jammed or broken, replace the drain pump assembly.

Tools needed: Flashlight

Check for a clogged drain standpipe

Pour a bucket of water directly into the standpipe. If it backs up quickly, the household drain is blocked — not the appliance. Clear the standpipe or call a plumber.

Tools needed: Bucket

Test the drain pump with a multimeter

Disconnect power. Remove the drain pump and test its motor terminals for continuity. No continuity means the pump motor is burned out and requires replacement.

Tools needed: Multimeter, Screwdriver set

Inspect wiring harness to pump

Check for burned, loose, or corroded connectors between the pump and control board. Repair or replace any damaged wiring.

Tools needed: Screwdriver set