I have a tank-fill Bezzera BZ99. It has always had a small leak coming from the waste output nozzle that feeds into the drip tray, ie. when you’ve poured a shot the back pressure blow off squirts back into the drip tray via this output.

This works as expected but the problem is, when the machine is heating up, water is sputtering out of this nozzle and flowing around the drip tray and onto the bench. It seems to have gotten worse recently too.

Why would the machine heating up cause water to enter the drip tray? bombcup suggested it might be the boiler max level probe being dirty but I’ve removed it and cleaned it and put it back. The other probe to the right of the boiler isn’t actually connected (see image below).

Also, the water tank has two hoses leading back into it. What are these for? They seem to feed a sputtering of hot water back into the cold water tank.

and so the discussion *cough* raged..

Thread on TooMuchCoffee regarding the leaking Bezzera BZ-99.

In the meantime, I’ve managed to do my usual trick and, thanks to Suzanne & Phil from (Bullet Coffee) who found it and showed me, I’ve upgraded to a Rancilio S26, which I should be picking up this Saturday from Leicester with help from Harvey.

A far bigger machine (4L boiler vs. 1.5L) this will be fed directly from the water mains rather than tank filled. Big Daddy Wayne will most likely be taking the Bezzera off me once I sort out its leak, replace the tired hoses and patch the drip tray hole.