Chapter 4 Fault diagnosis
SMSO-2-02.04- 15.07.03
Power PCB / unit control system /
Power relay
Faulty fuses
Faulty relay or power transistor
Faulty EEPROM
Faulty power relay
Hot water valve Valve seat clogged and not water-tight
(calcium)
Faulty coil
Faulty seal on closing element
Instant heater
Calcium on heating
Faulty heater
Faulty temperature sensor
Heat damage caused by over-heating
User panel
Buttons jam / foreign bodies caught in the
panel
The keyboard PCB is damp
Safety thermostat
Triggered as a result of over-temperature
Faulty / faulty contacts
Non-return valve /
Calcium / not water-tight
Hot water outlet
Outlet nozzle clogged
Motor
Faulty capacitor
Faulty RC module
Control set
O-ring defective
Too much / not enough grease
Rotary-vane type pump Clogged (calcium)
Worn out (dry running)
Faulty bearing (noisy)
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