If your steamer won't steam, the first thing to do is check your water level. If you have too little or too much water in the reservoir, it can stop the machine from working. It's also important to make sure that all of the hoses and seals are properly attached and that there are no blockages preventing steam from being released. Additionally, you may need to descale your appliance with a vinegar solution if it has been used for an extended period of time as mineral deposits can impair its performance; this involves running a full cycle of vinegar through the steamer before discarding it and adding fresh water. Finally, if none of these steps work, then replacing or repairing any faulty parts might be necessary - consulting with a qualified technician would be advisable in order to identify what needs repair or replacement.