Flow Errors; 2/3.7.1 Components And Parts T2-26 - WMF 800 Manual

Engineering
2/3.7

Flow Errors

The flow meter is the sensor that recognizes the cause of faults if the flow is too slow
for any brewing operation, beverage metering and for steam boiler inflow. Pressure
that is too high in the brewing system can be detected indirectly by monitoring flow.
The less water pumped by the oscillating pump with low flow, the greater the pressure.
This can, for example, be caused by a clogged brewing sieve, which allows the pressure
to increase so much in the brewing unit that the bursting pressure could be reached.
This is prevented by software.
2/3.7.1 Components and parts
The most frequent errors which the customer can fix are shown here:
• "Refill water tank"
• "Grinding too fine?"
• "Machine cleaning"
Components which can cause flow errors:
flow meter
• Hose before and after the flow meter (kinked or crimped)
• Pump
• Filter old / used up
• Water tank fine sieve clogged
• Brewing unit (inlet, hose to the brewing unit, lower piston or upper piston)
• Coffee spout Y-piece
• Flowmeter contaminated
For all error messages, check the flow errors:
• is there air in the system (bleed coffee machine via hot water dispensing)
In the case of clogging on or after:
• Hot water valve
• Steam boiler inlet valve
Due to the stoppage, the brewing valve is forced open by the high pressure, and water
runs into the brewing chamber.
T2-26
beverage sel. locked
fill the water tank
grinding too fine?
clean machine
See instructions, error messages, troubleshooting
Part 6
© WMF 800 / 900 / 1000 S / 1000 pro S Edition 07/2014 - KMT