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Is the water tap open?
Does the water load solenoid valve work?
Is the water feed flow a min. of 5 l/min?
Is the water inlet filter clean?
Is the load solenoid valve filter clean?
Is the overflow inserted?
Do the tank/boiler pressure switches work properly?

Alarm codes for automatic hood type dishwasher (see paragraph 11.2.1 Alarm codes for automatic hood type dishwashers)
 
1 – Hood is closed but the upper end limit switch (FC_UP) is active
2 – Hood is opening (starting from completely close position), but the lower end limit switch has not been
released. 
4 – During hood opening the lower end limit switch (FC_DW) has been activated
5 – Hood opening timeout: hood opening duration must be less than 18s (fixed value).
Check if the motor works properly
6 – Hood is open but the lower end limit switch is active (FC_DW
8 – Hood is closing (starting from completely open position) but the upper end limit switch has not been
released.
10 – During hood closing the upper end limit switch (FC_UP) has been activated.
11 – Hood closing timeout: hood closing duration must be less than 18s (fixed value).
Check if the motor works properly.
14 – Combination not allowed:
upper end limit switch (FC_UP) and lower end limit switch(FC_DW) are both activated
20 – Overcurrent during hood opening phase
22 – Overcurrent during hood closing phase.
30 – On board motor driver overtemperature.

Are the connectors correctly connected?
Are connector contacts cleaned?
Does the air trap of the tank work correctly?
Is the level sensor broken (replace it with a new one)?

Has the overflow been removed?
Is the water drain blocked?
Is the drain pump blocked?
Are the air trap and tank pressure switch clean?
Is there a constriction in the drain tube?
Is the pump breather pipe returning to the tank clogged or constricted?
Does the tank pressure switch work properly?
Is there a hole in the drain tube (only for versions with drain pump)?

Is the water drain blocked?
Are the air trap and tank pressure switch clean?
Does the tank pressure switch work properly?
Is the load solenoid valve blocked? (see electrical wiring diagram – YV1 Filling solenoid valve)
Is the load solenoid valve relay stuck? (see electrical wiring diagram – RL5 relay of AP2 board)

Does the boiler level sensor work properly? The boiler could be empty.
Are no-original power resistances installed?

Has the boiler temperature been changed (BTC – increased above 90°C)?
Has the software alarm value been modified (bHi)?
Does the boiler level sensor work properly?
Boiler relay/relays sticked (see electrical wiring diagram – RL1/ RL2/ RL3 relays of AP2 board)?

Is the feed water above 60°C?
Has the software alarm value been modified ()?
Is the rinse water temperature too high?
Is the tank relay stuck (see electrical wiring diagram – RL4 relay of AP2 board)?

Is the temperature sensor broken or disconnected (see electrical wiring diagram – ST1 Tank
probe)?
Is the temperature sensor connector correctly inserted?

Is the temperature sensor short-circuited (see electrical wiring diagram – ST1 Tank probe)?

Is the temperature sensor broken or disconnected (see electrical wiring diagram – ST2 Boiler
probe)?
Is the temperature sensor connector correctly inserted?

Is the temperature sensor short-circuited (see electrical wiring diagram – ST2 boiler probe)?

Is the temperature sensor broken or disconnected?
Is the temperature sensor connector correctly inserted?

Is the temperature sensor short-circuited?

Does the rinse pump work correctly?
Is there any bottleneck in the hose, that connect the air trap and the board sensor?