F4 error and vacuum indicates filter problem even after cleaning

Safety: Remove the battery before working near the filter housing.

• Verify filter type: Ensure you are using the correct original Parkside filter element specified for your model. Some models require a specific keyed or chipped filter.
• Reseat filter: Remove and reinstall the filter, making sure it is fully seated and the cover is properly latched.
• Inspect sensor: Look for a small switch or sensor near the filter seat. Check for bent parts or debris preventing proper operation.
• Check wiring: If visible, inspect the wires from the sensor to the PCB for damage.
• Replace sensor/filter housing: If the sensor is physically damaged or the housing is warped, replace the filter housing or sensor assembly.