Set Appliance State:

Mains Power Off
On/Off Switch ON
DHW and CH thermostats to MIN (fully anti-clockwise)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

When the boiler is powered up it will carry out a short self-check, the display should operate and show the current flow temperature. The boiler should then remain in standby i.e. pump not running and no attempt to fire.
Does the boiler behave as described?