When you hear an intermittent noise, water is intermittently pumped from the water tank into the boiler. If the noise continues for a long time or if it becomes very loud, first check whether the water tank is properly inserted into the appliance. If this is the case but the noise still persists, switch off the appliance and contact the Philips Customer Care Center or your Philips dealer.
The appliance is equipped with an illuminated fan that runs continuously during use. This fan optimizes the performance of the appliance and cannot be switched off.