Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to ignite and run.
Does the temperature rise conform to the table on the right and is operation satisfactory?
Lower flow rates than that stated will result in higher temperature rises.
If you wish to investigate poor DHW flow rate click HERE.
Note:
Monitor pump operation during DHW operation.