Problem 5 - The espresso seems cold and under-extracted.
Excessive rinsing of the portafilters with water from the brew group
will gradually drive down the temperature in the brew boiler. This
lowering of the brew temp will result in espresso shots that are less
than ideal: weak extraction, very little crema, and unusually high
volume.
Use water from the machine’s hot-water tap to rinse portafilters.
Solution 1 - Limit rinsing of the portafilters with water from the brew group.
Solution 2 - Reset the thermal limit switch or replace if necessary.
1. Inspect the thermal limiter to
determine whether or not it has
tripped. If tripped, the red or
black reset button will protrude
upward slightly. Press down
firmly to reset.
Important ! Before proceeding with solution 2, the following safety measures must be taken.
1. Turn the machine off.
2. Disconnect the machine’s power cord from the wall outlet.
2. Replacement of the
thermal limiter may be
necessary if it fails to
reset properly.
3. Disconnect the two
wires on either side of the
thermal limiter.
4. Loosen the two screws
securing the thermal limiter
to the group cap.
5. Remove and
replace the thermal
limiter.
6. Tighten the securing
screws and reattach the
wires. Test for proper opera-
tion.
If the temperature of the group cap reaches 266 F, the thermal limiter will trip, cutting power to the
heating element.
