Smeg 50's style Instruction Manual page 22

Problem
The "crema" of the coffee
is dark in colour and
comes out of the spout
slowly
The and
flash for a few seconds
44
Cleaning and care
The ground coffee has been
tamped too hard.
There is too much ground coffee. Decrease the quantity used.
The boiler outlet or filter is
blocked.
The coffee grind is too fine.
Scale build-up.
Steam knob open.
lights
Boiler temperature too high.
Scale build-up.
Possible causes Solution
Tamp the coffee with less
force.
Clean the outlet and the
filter.
Use only ground coffee for
espresso machines.
Perform a descaling cycle.
Close the steam knob.
Cool down the boiler.
Perform a descaling cycle.