F06 is a heater NTC fault that causes this error code.
But first lets try a reset.
Turn the dial to off.
Then turn to 6 oclock position
Then press the start button 3 times.
Turn the dial 1 click clockwise.
Press start 3 times again.
Then turn it off.
Now when you turn it back on it would have cleared the error code.
Then see how it goes from there as it could have been a one off fault. But if it comes back again then you need to test the heater NTC sensor. This is located on the heater on the back.
So you need to remove the top and the back panel.
There you will see the heater and on there are 2 thermostats. Test them and see if any are faulty. Now one is a NTC so will give a hight resistance reading of about 20K ohms. If any are faulty then you need to replace them and fingers crossed this will cure the fault.
So try the above and see how it goes from there. But if you need anymore info just get back to me.