Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Boiler DHW thermostat set to MAX
Both wires connected to Modureg
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the burner to ignite and boiler to run in DHW mode.
With a flow rate at the tap of approximately as per the table there should be a temperature rise of approximately 35°C and operation should be satisfactory.
A flow rate of less than specified will result in a higher temperature rise.