Remove the side and top panels of the machine.
On the left hand side you will see a clear plastic panel full of tubes and small tanks. This is the metering tank. At the bottom left of this unit, is a black pipe held on with a clip. There will almost definately be a blockage between this point and the sump. You can either buy and fit a new pipe or do what I did with mine, which was to remove it and clean it with hot water and a bottle brush. Seems to work like new again now.
You'll have to get the machine onto it's right side to remove the lower end of the black pipe from the sump. I drained as much excess water as possible out of the machine by sitting it on bricks, tilting it to the left and catching the water in a dish as it came out of the float hole. Some will also come out of the funny plastic tube which runs across the top of the machine - I carefully removed this first and caught this water in a pan.
Drain the waste pipe and disconnect the water supply.
Replace the right side casing on to protect the feed to the upper spray unit and put the machine on it's right hand side. Once the machine is on its right hand side, fin the water inlet valve and carefully remove its bracket from the chasis of the machine. You will need cross head and a torx screwdrivers - one for each screw. Once this is loosened, push some of the water supply pipe into the machine so you can move the bracket to the right a little to gaine access to the waste pipe. Remove this by removing the two gold coloured screws. This should now give you easy access to the sump end of the black pipe which lead from the metering tank. Remove this and clean it out. Pop all the parts back, stand you machine upright. Reconnect the watre supply and the waste and give it a rinse cycle to test - number 1 on the dial.
Hope this helps. My apologies if any of the take apart is not completely accurate - I don't want to turn my machine over again to check!
Mark
What an absolute genius. Thank you soo much for this. In fact it may not be necessary to remove the pipe completely. just put machine on a couple of milk crates. remove left panel. drain by setting prog to say 4 wait till pump empties all then open door to stop filling. Unlcip black pipe end drain this full into jar underneath m/c. Mine had tons of gunge in it which came out really easily. Job done. Once set up takes less than 5 min. Thanks rup Nickols
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BOSCH SMS4472GB/20 DISHWASHER: on the left side of the unit, a little to the right of the float there is a vent hole that leaks a small amout of water twice in a full cycle.
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