Unplug the dishwasher and remove the lower basket. Unscrew the cylindrical filter anti-clockwise and lift it out, then lift out the flat fine mesh filter beneath it. Rinse both under warm running water, scrubbing the mesh surfaces with an old toothbrush. Pay particular attention to the fine mesh — grease and food particles that pass through the coarse filter collect here and prevent properly filtered water from reaching the turbidity sensor.

With both filter parts removed, look down into the sump cavity. The turbidity sensor is typically a small rectangular or cylindrical component with a transparent or translucent optical window, mounted in or near the sump wall. Using a clean, damp cloth or a soft toothbrush, gently wipe the sensor window and the surrounding area to remove any grease film, food residue, or limescale deposits.

Add a proprietary dishwasher descaler or two tablespoons of citric acid to the base of the tub and run a full 65-degree cycle with nothing else in the machine. Limescale and grease build up gradually on the sensor window and the optical beam it uses to read water clarity becomes progressively more blocked, eventually triggering F07.

Excess detergent — particularly powder or gel dosed for hard water in a soft water area — produces heavy foam that fills the sensor area with bubbles, blocking the optical reading entirely. After the descale cycle, switch to a dishwasher tablet that matches your water hardness, or reduce your powder or gel dose to the level appropriate for your water softness setting.

With the dishwasher unplugged, remove the lower kickplate panel. Locate the wiring connector to the turbidity sensor and check that it is fully seated with no corrosion or moisture on the pins. Disconnect and firmly reconnect it.

Replace the filter assembly firmly, replace the lower basket and run a standard programme with a normal load. The dishwasher should proceed through each phase — fill, wash, rinse, dry — without displaying F07.