Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Turn Hot Water Tap On
Boiler DHW setting to MAX
Refit diverter valve motor
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow boiler to ignite and run on DHW
Does boiler produce a DHW temperature rise as per the table and is operation satisfactory?
Note:
Flow rates less than stated above will produce a greater temperature rise.
Flow limiter of 10 litres a minute is fitted as standard in the 25C - it is an optional accessory in other models. To investigate poor flow rate click HERE.