Help - Bosch dishwasher not cleaning the dishes

If a Bosch dishwasher suddenly stops cleaning properly, the fault is often something simple in the wash system rather than the heater itself. If it’s still heating but leaving food behind, I’d start with the basics below.

1. Check and clean the filters thoroughly Remove the filter assembly from the bottom and wash all parts under the tap. If the fine mesh is greasy or blocked, water circulation suffers and dishes won’t wash properly.

2. Inspect both spray arms Take out the lower and upper spray arms if possible and check every jet hole for blockage. Bits of food, labels or limescale can stop them spinning or reduce spray pressure. Rinse them through well.

3. Make sure nothing is obstructing the spray arms Large plates, chopping boards, tall items or badly loaded pans can physically stop the arms turning. After loading, spin them by hand to confirm they move freely.

4. Check water level and filling Start a wash, let it fill, then open the door carefully. There should be a reasonable amount of water in the sump area. If it’s underfilling, possible causes include a restricted inlet filter, low water pressure, or a fill system fault.

5. Look for poor circulation If the machine fills and heats but the spray action sounds weak, the wash pump/circulation system may not be producing enough pressure. That would explain food being left on dishes even on a hot programme.

6. Review detergent and programme use Try a proper dishwasher cleaner, ensure you’re using fresh detergent, and test on an intensive programme with the machine empty first.

Always isolate the appliance from the mains before inspecting internal parts. If the simple checks don’t improve it, you may need a qualified appliance engineer, especially for any mains-related internal testing.

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