I had the same problem and fixed it. I took the bottom off. There is two hoses there which one has a (valve)plastic thing with little ball in it. I took the hoses off and the valve out of the hoses. I then cleaned the hoses,valve and the pipe arround the burner. There was like hard white dirt in them. I put back on the hoses without the valve. Tried to make coffee and it worked but was noisy . I ran it like that for a few days and still worked but noisy. I then took hose off and put back in valve. Then tried it again. It still worked but now it is quiet. Clean parts,hoses,valve,and pipe near burner good. Worked for me. Good Luck on yours.
Answers & Comments
I had the same problem and fixed it. I took the bottom off. There is two hoses there which one has a (valve)plastic thing with little ball in it. I took the hoses off and the valve out of the hoses. I then cleaned the hoses,valve and the pipe arround the burner. There was like hard white dirt in them. I put back on the hoses without the valve. Tried to make coffee and it worked but was noisy . I ran it like that for a few days and still worked but noisy. I then took hose off and put back in valve. Then tried it again. It still worked but now it is quiet. Clean parts,hoses,valve,and pipe near burner good. Worked for me. Good Luck on yours.