Leaking from filter after cleaning

If the washer has started leaking from the pump filter after it’s been removed and refitted, the cause is usually something simple rather than a major fault.

1. Isolate the appliance from the mains first. Before checking anything inside, unplug it. If you need to pull it forward, take care not to strain the fill hose or drain hose.

2. Remove the filter again and inspect the seal. Check the rubber O-ring or gasket around the filter cap. If it’s twisted, trapped, damaged, split, or missing, it will leak. Even a small nick can be enough.

3. Check for debris on the sealing faces. A bit of fluff, grit, hair, limescale or a small object trapped on the filter housing can stop it sealing properly. Wipe both the filter seal and the mating surface clean.

4. Refit it carefully. Make sure the filter is going in square and threading correctly. Cross-threading is a very common reason for leaks after cleaning. Tighten it firmly, but don’t overtighten and damage the threads or seal.

5. Inspect the filter body and housing. Look for cracks in the plastic cap, damaged threads, or distortion of the housing. On some machines the filter can feel tight but still not seat properly if the threads are worn.

6. Test with a small rinse or drain cycle. Watch closely with the kick strip or flap open if possible. This helps confirm whether it’s the filter itself or a leak tracking down from elsewhere.

If the seal or housing is damaged, the filter or pump assembly may need replacing. If you’re unsure, or any mains-related internal work is needed, it’s best to get a qualified appliance engineer.

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