Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
Set selector switch to ch/dhw
Dhw temperature control to max
Measure temp across cold mains inlet and dhw outlet using
FGA temperature clamps, as close to the boiler as possible
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Allow boiler to ignite and run on DHW
With a flow rate at the tap of:
Compact / Sabre 24: 9.8 litres/min
Compact / Sabre 28: 11.5 litres/min
Is there a temperature rise of approximately 35° C and is operation satisfactory?