Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Attach temperature probes to the flow and return pipes as indicated
DHW Temperature Selector set to MAX
Set flow rate to approximately as per table
Gas On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary.
Allow the burner to light and establish.
Monitor the temperature differential between the
flow and return pipes for at least 2 minutes.
The differential should be approximately 25°C or lower.