Pressure And Leakage Checks - Nespresso Maestria EF 285 Service Manual

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F U N C T I O N T E S T S
7) Open the valve until water begins to
flow.
8) Close the valve until the pressure
gauge indicates 12 bar.
Constantly monitor the pressure
gauge and if required readjust the
valve. As the temperature
increases, so does the pressure,
readjust the pressure to 12 bar
when required.
9) Carry out measurement for approx.
30 sec.
10) Control measuring cup: at least 60 -
120 ml of water must be in the measur-
ing cup.
11) Open the valve and let water flow out
of the pressure tester.
Notices:
• Should less than 60 ml leak out, then
the pump for coffee is defective or
there is a leak in the water system for
coffee.

9.4 Pressure and leakage checks

Check the following parts of the coffee machine for leakages:
• Compact brewing unit
• Hose connections
• Thermoblocks
• Pumps
Dangerous mains voltage inside the coffee machine!
Do not touch any parts under voltage while checking for leakages!
Dangerous hot parts under pressure inside the coffee machine!
Do not touch any hot/pressurized parts while checking for leakages!
Always wear protective goggles.
Maestria / Gran Maestria service manual
7. / 8. / 11.
10.
> 60 ml
30 sec
9.
• Large deviations in indicated pressure
while measuring (± 4 bar) means that
the pump for coffee is defective.