La Marzocco linea Serie Manuel De Fonctionnement page 22

8. Mandatory maintenance and check-up operations
These operations are in addition to the Maintenance and Periodic Cleaning Operations
as specified in Chapter 7.
The following maintenance and check-up operations sould be carried out by a qualified
technician.
N.B. These periodic maintenance operations are not covered by warranty.
EVERY THREE MONTHS
▪ Replace group gaskets
▪ Replace diffuser screens
▪ Clean auto-fill probe
▪ Check vacuum breaker for proper
operation
▪ Inspect water inlet valve
▪ Inspect drain system for leaks or clogs
▪ Check flow rate for each group
▪ Check brew temperature
▪ Check that brew pressure is at 9bar
▪ Check all switches for proper operation
▪ Check/note water hardness
(Water quality must be within the range
of parameters specified in the chapter on
Installation, otherwise warranty is voided)
If AV Model:
▪ Check shot volumes
▪ Test flowmeter's ohm value (ohm value is
acceptable if greater than 1.8 K ohm, and
less than 2.2 K ohm
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If MP Model:
▪ Rebuild MP valve
EVERY SIX MONTHS
▪Rebuild steam assemblies
EVERY YEAR
▪ Replace portafilter baskets
▪ Inspect group valve plungers
▪ Inspect vacuum breaker
▪ Inspect steam boiler pressurestat
▪ Inspect contactor
▪ Replace over-pressure valve