Chapter 4 Fault diagnosis
SMSO-2-02.04- 15.07.03
Power PCB /
Unit control system
Faulty fuses
Faulty relay or power transistor
Faulty EEPROM
Refrigerator
Faulty starter relay
Faulty motor / compressor
Faulty temperature sensor
Ventilator defective
Ventilation valve
Clogged (coagulated mass of milk)
Faulty lifting magnet
Valve battery
Valve seats clogged
Faulty coils
Faulty seals on closing element
Steam generator Calcium on heating
Faulty heating
Temperature sensor defective / calcified
Level probe: calcified
Heat damage caused by over-heating
Air valve
Nozzles clogged / incorrectly installed
Baffles clogged
Control panel
Buttons jam / foreign bodies caught in the panel
The keyboard PCB is damp
Milk foamer head
Injector nozzles clogged
Interior of housing dirty / clogged
O-ring defective
Microswitch for foamer head detection is faulty
Safety thermostat
Triggered as a result of over-temperature
Water cylinder
Oxidised
Piston not running
Milk container /
Level sensor
Faulty sensor
Rinsing water and
Squeeze cylinder valves
Valve seats clogged
Faulty coils
Faulty seals on closing element
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