My electric drip coffeemaker had stopped functioning. It was producing steam and not much hot water. I figured this could only happen if it wasn't getting enough water. But the reservoir was full. After disassembly I discovered a vinyl hose connecting the reservoir with the heating element. Inside the vinyl hose were two little rubber valves which I assume are there to stop the hot water from going back into the reservoir, forcing it to expand up the outlet. Inside one of those rubber valves was a relatively large piece of unground cofffee bean, hindering the flow of water into the heating element.
Back to good coffee in the morning.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13