No problem, thanks for checking it.
F3 indicates a fault in the heater circuit.
The heater, wiring or main board will be the cause.
Normally this is a failed heater but on the odd occasion I've come across a failed board.
You need to use a multimeter to test the heater and wiring.
If both are ok, you need to replace the control board.
If the heater is open circuit, you need a new heater.
Obviously, if you cannot do the work yourself, you'll need to get someone in to do it for you.
If you are working on the machine yourself, be very aware that the metal work on this machine is razor sharp.
Hope this helps