Chapter 4 Fault diagnosis
SMSO-2-02.04- 15.07.03 95
System / component Possible cause Remedy
piston motor timeout
Damage to motor or to gear
Position switch faulty or is not actu-
ated by the brewing unit
Electrical test on motor: see “control
system diagram, piston motor”
Functional check on position switch;
if necessary set the switch position or
replace the position switch
Selection locked
comms. interrupted
Interruption between RS 232 inter-
face and accounting unit
Check the cable and/ or the supply
voltage.
Check using the Info folder, sections
6/7
Selection locked
** LAN-Timeout **
Selection locked
milk door open
The limit switch is not in the correct
position (screw loose)
The door limit switch is faulty
Check if the door operating pin is
able to actuate the button roller; fas-
ten the switch into the correct posi-
tion.
Electrical check: see “control system
diagram, refrigerator cover switch”
motor current
Current to switch off piston motor not
reached.
Check the “compaction pressure”
setting and readjust if necessary
Replace the piston motor
motor driver error
Concerns the grinder and the piston
motor control system when an inter-
nal measurement is made on the
power PCB there is current, but no
motor is actuated.
Replace the power PCB
Select product
grinder left blocked
Foreign bodies in the grinder, so that
the grinder blades are blocked.
Damage to motor or to gear
Clean the grinder: see “Repairs,
dismantling/replacing grinder
blades”)
Electrical test on motor: see “Control
system diagram, left-hand grinder
motor”.
Replace the motor: see “Dismantling
components, dismantle/replace
grinder”
Select product
grinder right block.
Foreign bodies in the grinder, so that
the grinder blades are blocked.
Damage to motor or to gear
Clean the grinder: see “Repairs,
dismantling/replacing grinder
blades”)
Electrical test on motor: see “Control
system diagram, right-hand grinder
motor”.
Replace the motor: see “Dismantling
components, dismantle/replace
grinder”
level probe steam
After two minutes of feed time, the
water level in the steam generator
still not reached.
Faulty feed valve
Calcified level probe
Calcified water supply
Electrical check: see “Control system
diagram, level probe steam”
Product ## Error!
Error in RAM Check the parameters for the product
button concerned for unrealistic set-
tings End programming, switch the
machine off and then on again. If the
error is still present: Carry out a Con-
fig.-Reset, reprogram (with Save
Data cards). If the fault still cannot be
rectified, replace the unit control sys-
tem.
Selection locked
container n.i. place
The limit switch is not in the correct
position (screw loose)
The limit switch to the drawer for
coffee grounds is faulty
Check if the drawer is able to actuate
the button roller; fasten the switch
into the correct position.
Electrical check: see “Control system
diagram, drawer limit switch