Display shows F0, vacuum refuses to start, often after filter removal

Safety first: Remove the battery before manipulating the filter housing.

• Verify filter installation: Ensure the correct Bosch filter cartridge is installed in the proper orientation. Align any arrows or tabs as indicated in the manual.
• Check filter cover: Close the filter or dust bin cover firmly until it clicks. Some models will not run if the cover is slightly open.
• Inspect sensor tab: Look for a small plastic tab or protrusion on the filter or cover that presses a switch inside the housing. If this tab is broken, the vacuum will think the filter is missing.
• Test switch (if visible): With the battery removed, gently press the microswitch lever with a non-metallic tool and listen for a click. Do not force it.
• Replace parts if needed: If the filter or cover is damaged, replace with genuine Bosch parts. If the switch itself is faulty, the filter housing or main body section may need replacement.