Set Appliance State:

Mains Power Off
NO demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

When the power is switched on the appliance should carry out a self-check and enter standby, this will take approximately 30 seconds to complete.
If the appliance has successfully entered standby mode the display with show the set temperatures for the HW and heating.
If 'OFF' is on the display, then press the power button once briefly.