Set Appliance State:

Mains Power Off
Ensure there is no demand from heating controls
Ensure all DHW Taps are turned OFF
Summer/Winter selector to Winter
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Cancel the purge cycle countdown.
(This can be done by pressing the reset button)
Does the appliance go into standby without the
pump or fan operating?