Troubleshooting My Philips iron sizzles when I place it on its heel If your Philips iron makes a sizzling noise when you place it on its heel, find out why this happens here. A sizzling noise is normal It is normal for your Philips iron to make a sizzling noise when you place it on its heel. It is the sound of water coming into contact with the walls of the soleplate's steam chamber. Do not worry. Your iron's performance is not affected at all by this.