Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance if required.
(press reset button once then release)
Does the fan run?
If fault code F32, F34, F37 occurs or a house and fan symbol (also an indication of a fan fault) appear in the lower left hand side of the display click HERE.
Note:
It can take up to 1 minute for the house and fan symbol to appear and up to 2 minutes for a fan fault code to be shown.