Set Appliance State:

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

Observation:

Ensure boiler is in DHW & CH mode (tap and radiator symbols displayed), to select DHW & CH mode press MODE button.
Reset appliance (press reset button for 2 seconds and release), after reset the boiler will run a self check.
Allow 40 seconds for self-test to complete before proceeding.
If self check has completed successfully the CH set temperature will be displayed (see fig 1, typical value)