Most of the problems are caused by minerals in the water. Take the tank off and see if there is a strainer (if there is back blow with compressed air, you may have to remove it ..3 screws...I did) reinstall and check that water flows freely when valve depressed. Go to store and purchase DISTILLED WATER in gallon jugs (not spring water)...about a dollar a gallon...use this only...My problems were ...add water light on when full...brewing a half of a cup...descale light on...you may want to descale it at the same time...Mine has been working great for about six months...