15
Servicing and Maintenance
Product:
Espresso-Machine
Model: Semi-automatic,
built-in
Service-Instruction: 3/04 (Thermostat)
Problem:
Water for brewing coffee or water for hot beverages from the water
(or dry steam) wand is not delivered at the desired temperature. The
cause may be that one of the two safety thermostats on the heat
exchangers defective.
Under correct working conditions, the electrical connections in the thermostats are closed and power
is delivered. In the case of a fault (for example the heat exchanger runs dry causing subsequent
overheating of the heat exchanger), the reverse circuit breaker is activated to prevent the heating
elements from burning out.
Cause:
The heat exchangers on the machine are positioned one on top of the other. Each
heat exchanger is equipped with a safety thermostat. The sensors establish the
maximum and minimum temperature of water in the heat exchanger. The safety
thermostats are activated when there is no water flowing into the heat exchanger
or when defective sensors signal abnormally high temperatures. In theses
instances, the relative thermostat is activated breaking the circuit and it
subsequently needs to be reset manually (reversible).
Solution:
The machine needs to be opened up and the upper cover removed
following the relative service instruction thus making access possible
to the two thermostats.
Safety Advice for Service Engineers
Attention: Before commencing any work on the appliance, it should be “disconnected”
from the electricity supply. This can be done by:
either removing the appliance plug from the mains socket or by isolating electricity
supply to socket through safety circuit-breaker or by turning off electricity completely
at mains switch.
Summary of Contents for SUPREME DED400XP1
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