Hi, sorry to hear that the extra steam lever isn't working. We find we hardly need ours but do not have children. You don't say how old the unit is. You have the manufacturer warranty but also over and above this is the Consumer Law which states that goods should work as expected for a reasonable life expectancy. So perhaps mention you are aware of your Consumer Law rights when you approach the manufacturer. I would expect at least 5 years from this steam mop as it is a premium product. Your state consumer affairs department can assist you further. All the best.