📹 How to Resolve Issues with the Group Head Not Flushing on the Bezzera DUO MN

My Group Head Won't Flush When I Put the Lever Down

  • Move the lever up and down and see if resistance is felt in any direction from the cam moving between actuators (valves). If it will not drain, and not much resistance is felt, remove the bottom of the E61 group head and inspect the actuators. They may be broken, or ground down from poor maintenance so that the cam does not make contact with the top of the actuator.
  • Remove cam and inspect for flat spots. If the cam is ground down it may not be making contact with the actuator.
  • With no portafilter in place, lift lever. If no flow out of the group head is present and water is flowing from the drain, remove the top of the group head and inspect the jet for a blockage.
  • If water is just running through out of the discharge and the pump is constantly running, a blockage may be present on the intake line into the boiler. This can be removed and inspected, or the machine will need to be sent in for repair/hydraulic system descale.
  • The DUO MN has a line that goes from the top of the vacuum breaker into a plastic T-connector that attaches to the front discharge of the machine. If steam is pouring out of the discharge, it is likely due to a sticking vacuum breaker that will not seal so it is constantly venting steam out of the discharge. The vacuum breaker should be taken apart and cleaned/lubricated. If this does not work then it should be replaced.


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