Maestria / Gran Maestria service manual
54
R E P A I R S
7.4.7 Replacing thermoblocks and NTC temperature sen-
sors
A defect thermoblock can only be replaced with an assembly consisting of:
-
thermoblock cover (upper or lower part of encapsulation),
-
thermoblock,
-
pre-wiring with NTC temperature sensor and thermo fuse(s).
Replacing thermoblocks
•
Remove steam valve (821) for better access to top latch of thermoblock cover.
•
Pull fluid connection clip and remove outlet valve (61, only for Maestria) from steam
thermoblock (810).
•
Remove all wires from cable guides on top cover (810).
•
Loosen 2 fixing screws (TX 10) on top cover.
•
Release 2 latches with screwdriver and remove cover with steam thermoblock (810).
•
Remove electrical connections and hoses from defect steam thermoblock or replace
NTC temperature sensor (47).
To replace coffee thermoblock (809):
•
Remove electrical connections and hoses from defect coffee thermoblock.
•
Loosen 2 screws (TX 10) and remove coffee thermoblock with bottom cover (809).
•
Now the NTC temperature sensor (29) can be replaced.
Assembly checkpoint
•
Tighten the new NTC temperature sensor and spring ring with a torque wrench (for
max. torque see “Repair and mounting tips” on page 40).
Depending on
national regulations,
one or two thermo
fuses are mounted on each
thermoblock (see “Wiring
diagrams” on page 91 and
following).
Remaining water will
flow out of the ther-
moblocks while
removing the hoses.
821
61
29
47
810 (steam)
809 (coffee)
