WMF 800 - 2;4.2.3 Lower Piston T2-32

Engin eering
T2-32
© WMF800 / 900 / 1000S / 1000proS Edition 07/2014 - KMT
2/4.2.1 Outlet piston (top piston with brewing sieve)
The piston is affixed to the brewing sieve. The coffee is filtered through the brewing
sieve. The brewed coffee is directed over acover (0.6mm) directly to the All-in-One
spout.
Error without display message
If the upper piston is obstructed, an error is recognized by the flowmeter.
Spare parts
• Complete outlet piston
2/4.2.2 Friction piston
The friction piston affixes the basic position for the lower piston which releases the
brewing chamber. The spring assures the necessary holding power.
Technician instructions
If the spring is not present, there will be alot of ground coffee around the brewing
chamber.
Spare parts
• Complete friction piston
• Spring
2/4.2.3 Lower piston
The lower piston serves to let in the brewing water. The brewing water reaches the
brewing chamber if the lower piston lays properly on the lower stop of the brewing
chamber. The lower piston is brought upon lifting the brewing unit into this position
by the friction piston.
If the drill holes of the piston are obstructed, the brewing water reaches the ring gap
to the outside diameter, well-distributed in the ground coffee.
After remove and replace the brewing unit, abrewing cannot run correctly if the limit
switch is impacted after replacing, and the lower piston cannot reach the insertion
position (lowest position in the brew chamber). This is unavoidable due to the
principle.
Spare parts
• Lower piston complete
• Snap ring
• Complete brewing cylinder
See flow errors
chapter 2/3.7
Error messages, instructions, troubleshooting
see part 6