Set Appliance State:

Mains Power Off
Ensure NO demands
Summer/Winter switch set to SUMMER (switch sticking out)
DHW and CH control knobs set to MAX
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Only the power LED should be illuminated - other LED's illuminated or flashing indicates a fault code.
The boiler should remain in "standby" and not attempt to fire.
Does the boiler behave as described?