Set Appliance State:

Mains Power Off
CH Demand
DHW Demand
DHW Temperature set to Max
CH Temperature set to Max
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Run DHW tap and allow boiler to reach a reasonable working temperature.
Then run the CH and allow the appliance to fire and heat to a reasonable working temperature.
Note:
Some radiators can be turned off to reduce the time it takes for the central heating to reach a reasonable operating temperature.
Monitor the operation of the appliance.
Does the boiler shut down and show error code E110?