Set Appliance State:

Mains Power Off
Ensure no demands
ECO mode ON (ECO on the display)
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Allow the appliance to complete its self-check and air purge cycle, this will take approximately 5 minutes to complete, as soon as this completes ensure the appliance is in ECO mode (ECO on the display) press the power button briefly to toggle on and off.
During the air purge cycle the fan will run continuously and the pump will pulse on and off for 5 seconds at a time and FH will be displayed. When the purge period ends FH will leave the display, the fan should stop running and the pump should no longer pulse.
If a fault code is present, then choose that option from below.