Troubleshooting When and how should I descale my Philips steamer? When the time has come to descale your Philips steamer, a light will start to flash. When this happens, please follow the descaling instructions below: Step 1: Fill the water tank with white vinegar (8% acetic acid) up to the maximum level. Do not use any other kind of descaler. Step 2: Put the drip tray, the steaming bowls and the soup/rice bowl on the base properly. Step 3: Put the lid on top of the soup/rice bowl. Step 4: Put the plug in the wall socket. Step 5: Press the menu button for carrots and the + button to let the appliance operate for 25 minutes. Note: If the vinegar starts to boil over the edge of the base, unplug the steamer and reduce the amount of vinegar. Step 6: When the steamer switches to the keep warm function after 25 minutes, unplug it and let the vinegar cool down completely. Empty the water tank afterwards. Step 7: Rinse the water tank with cold water several times. Note: Repeat the procedure if there is still some scale in the water tank.