Baxi Solo 2 Problem!?

Hi,
I'm having the following problem with my Baxi boiler, this has happened a few times now..
All neons out except 'fan on', which flickers on and off with an clicking noise..

If i turn the dial to "0" the clicking stops and fan light stays off and clicking stops.


Any thoughts, boiler repair man hopefully coming out next week, but as you can imagine he is busy during this Festive and cold spell and my house is freezing at 8 degrees!