Set Appliance State:

NOT USED
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

The pre-heat function can be disabled by simultaneously pressing & holding the Reset & Info buttons until the word "BOOST" disappears from the display.
Note.
When the boiler is pre-heating, BOOST will flash, when the heat up has reached temperature BOOST will stop flashing.