Set Appliance State:

Mains Power Off
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

On/Off Switch On.
Depress DHW mode selector switch while observing the digital clock display.
Does the mode change on the display as the selector button is depressed?
Expected result:
From OFF first depression of switch - display will change to TIMED.
Second depression of switch - display to ONCE.
Third depression of switch - display to ON.