Set Appliance State:

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

Observation:

Observe the boilers display.
Are there two dashes either side of the flow temperature on the display?
Two dashes indicates manual / emergency mode.
Note:
Manual / emergency mode overrides all external heating controls in case they have failed and heating is required, this can be activated by the customer by pressing and holding the radiator symbol until the 2 dashes appear in the display.