75
Servicing and Maintenance
Product:
Espresso-Machine
Model: Semi-automatic,
Built-in
Service Instruction: 9/04 Water pump/water pipe
Problem:
The water pump is very noisy (running without water) and hot water
and brewing water are being delivered slowly because there is a
problem with water flow between the water container and the heat
exchanger.
Under correct working conditions, the water pump starts running after a brief
>>loud<< start-up noise and then progressively becomes quieter. Routinely,
water should flow from the water container through the flowmeter, the
distribution and stop valves and through the heat exchanger and a normal
operating noise level should be heard. When there is a fault, the first symptom is
a change in noise, which progressively becomes a loud >>rattling<< sound. This
means the pump is operating without water.
Cause:
a.
The water conducting pipe between the water container and flowmeter
is badly positioned or has a kink. The quantity of water required by
the pump is not being delivered. The pump is running on insufficient
water and is becoming noisy.
b.
There maybe an obstruction in the water flow system, or a general
>>furring up<< that leads to insufficient water being delivered to the
pump.
c.
The pump is faulty due to having >>run<< on insufficient water
causing overheating.
Solution:
To a.
Get rid of any kinks in the pipe (that can generally be seen by looking
through the entry hole in the back cover) by jiggling the section of the
tube between the blue cover of the water container and the flowmeter.
It may also be an idea to replace the in-let tube (leading from water
container to flow meter) with the newer, „second generation“ tubes
(harder and less prone to kinking).
You should then test the water flow system. This means water flow to
the Espresso brewing station (press the coffee brewing pad on the top
left of the control panel) and also water to the wand; press >>hot
water/steam<< and >>hot water<< or >>dry steam<< following
Summary of Contents for SUPREME DED400XP1
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