La Marzocco Coffee Makers & Espresso Machines - Recent Questions, Troubleshooting & Support

The boiler is contaminated, you will need to descale boiler and steam valves. Then rinse thoroughly about 5 times. The easiest way to check for this is to draw water from the tea spicket and check for smell and sediment. Something on the bottom of the boiler is being lifted when the machine fills and when it is heating. If there is a filter system on the line check to make sure it was changed recently.

Sounds like the safety thermostats on the machine is tripping because the machine is overheating or the circuit breaker is tripping because machine needs more amperage.

Left side above the element.

Machine is not getting water fast enough.

Adjust the expansion valve after making sure the pump brew pressure is at 9bar.

The brew solenoid needs to be replaced.

The fuse in the mainboard is gone.

It is possible that the thermostat on the grouphead needs to be reset.

Need group gaskets.

The hissing inside might be a leak from the vent valve or the level probe connections to the boiler. The leak from the middle if it is not the paddle version or group cap version then the plunger in the solenoid needs to be replaced. If it is the group cap version the plunger in the solenoid and or the gasket inside the group cover might need to be replaced. Before you open the group cover make sure you have replacement parts. You will need H1006, L103/A and L103/B and L100H.

De scale the left group , use the right group in the mean time .