Set Appliance State:

Boiler ON
Selector lever LEFT - HW Position
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Turn on HW tap, boiler lights to high flame.
Leave tap running, boiler should remain at high flame.
Monitor output temperature of water. Temperature should match the figures in the table (varies with flow rate).