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14
Operation
Service Manual EF 473 / EF 474 enVersion 1.0
Coffee machine status
After switching on, an automatic self-test is
performed to check if
- the NTC is connected,
- the NTC is short circuited,
- the thermoblock reaches the standby
temperature within 2 minutes.
Operating modes and detected failures are
indicated by backlighted coffee buttons as
listed in the following table.
Operating status of coffee buttons
Led off
Led on
Led blinking slow
Led blinking fast
Led blinking three times fast
Operating modes
Coffee buttons
left right
LED signals
Off off
Heat up (coffee) / self-test blinking slow
Ready on
Heat up (descaling) blinking fast
Small coffee / rinsing /
programming
Button “small cup“ is blinking slow
Button “large cup“ is on
Large coffee / rinsing /
programming
Button “small cup“ is on
Button “large cup“ is blinking slow
Descaling ready blinking fast
Pump on/off
(while descaling)
blinking fast
Emptying water system blinking fast
Failure blinking three times fast
Stand-by blinking slow, left/right alternately
Resetting blinking slow