28
Repair
Service Manual EF 470 / EF 471
en
Version 1.1
Checking for leaks and pump
pressure (2)
Procedure (continued):
8. Switch on machine. Press coffee button
after heating-up.
9. Open valve and leave water to run out for
approx. 10 s.
10. Fully close valve. The pressure will rise
rapidly initially and stabilise between
16 - 19 bar (check of pump pressure).
)
The pressure will rise slowly due to
the temperature increase.
If the pressure exceeds 23 bar, the
machine has to be switched off and
pressure released through the
pressure valve.
11. Perform visual and acoustic checks on all
pressurized connections.
The pump must not be in operation
for longer than 50 s without water
flow.
12. Switch off machine.
13. Open valve to empty pressure gauge.
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