42
Servicing and Maintenance
Product:
Espresso-Machine
Model: Semi-automatic,
built-in
Service-Instruction: 7/04 Sensors
Problem:
Brewing and beverage water (or steam) does not reach the prescribed
temperature. The reversible thermostats on both heat exchangers for
coffee and/or hot beverages are repeatedly triggered after being
manually reset, even though there appears to be no problem with the
water supply and in-let system.
Under correct working conditions, each sensor monitors the temperatures of the
coffee-brewing water heat exchanger and the hot water/steam heat exchanger
and regulates the minimum and maximum temperatures, which are different for
each heat exchanger. So long as the temperature is above the minimum, a
corresponding led (on the top left or right) of the espresso machine front control
panel will flash on and off. The led will stop flashing and will remain on when the
temperature falls to the minimum. The relative sensor will switch the heater off
when the maximum temperature is reached. When temperature exceeds the
maximum limit (sensor error/fault?), the safety thermostat is triggered
(reversible).
Cause(s):
a.
The sensor may be faulty or defective. The corresponding blue led on
the diagnostics panel remains permanently on, or the reverse safety
thermostat is repeatedly triggered.
b.
It may be caused by an obstruction in the water flow system (a kink in
tubes running between the water container and flow gauge) or, a
general >>furring up<< of the system leading to a lack of water in the
heat exchangers, resulting in overheating and the safety thermostats
being activated.
Solution:
to: a.
The sensor need to be replaced following this detailed Service
Instruction.
to: b.
The water flow system needs to be checked. This should include water
flow to the Espresso brewing head (top left function pad = press
deliver coffee) and to wand >>hot water/steam<< - >>hot water<< or
>>dry steam<<, following the relative operating instructions. During
this operation the >>water pump<< should function silently ensuring
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