Bezzera BZ10: Cleaning the Fill Probe

If the boiler in your BZ10 over-pressurizes or the pump runs until the boiler overflows, the culprit could be a dirty fill probe. Build-up can prevent the probe from accurately reading the water level in the boiler.

Tools Needed:
- 12mm crescent wrench
- Scouring pad/steel wool or wire bristle brush

1. Start by removing the panels.

2. Locate the fill probe:

3. Remove the electrical lead from the fill probe:

4. Using the 12mm crescent wrench, unscrew the upper retaining nut:

5. Pull the the fill probe out of the machine:
(Extensive build-up may prevent the probe from sliding out easily.)

6. Use the method of your choice to clear the build up from the fill probe.
(Remember even a tiny bit of build-up can cause problems, take your time and be thorough.)

7.  Re-install the fill probe by following these directions in reverse.

NOTE: On the first start up after cleaning the fill probe the boiler will likely need to be flushed, as it will still be over-full from the last time the machine was used.

To do this, start with the machine off and direct the hot water wand into a large pitcher, then fully open the hot water knob and power the machine on. As the machine reaches full temperature, water will begin to flow from the hot water wand. Wait for ~8-12 fl oz to be dispensed, then turn the hot water knob to the fully closed position and allow the machine to finish heating as normal.