1. The filter and/or the dust bag compartment was still wet when you placed it back into/onto the appliance
Always make sure the filter is dry before you place it back into the dust compartment and that the dust compartment is dry too before you assemble it onto the appliance.
2. The filter holder is not placed properly in the dust compartment
Always make sure the filter and the deflector have been placed in the dust compartment properly before you start sucking up liquids with the vacuum cleaner.
3. The maximum amount of liquid the dust compartment can hold has been exceeded
Please empty the dust compartment.
4. The vacuum cleaner is not held in the correct way during use
Always suck up liquids with the nozzle pointing downwards and with the vacuum cleaner at an angle of about 30 degrees.
If the above solution(s) did not help to solve your problem, please contact Philips Consumer Care.
You can find the phone number of the Philips Consumer Care Centre in your country under 'Contact' or 'Customer Service' on the 'Support' page of this site.