Unfortunately by what you describe, I am unable to offer any assistance whatsoever to you as the controls you mention make up a very small part of the problem...
I would suggest that you have a fault on your appliance rather than the controls - Check that there is sufficient water pressure in the appliance (Bottom, right hand side should be at 1Bar), ensure that the boiler has no warning "red" lights being displaid and that it has power to the appliance itself.
If all is good, call in an Experienced CORGI Registered Engineer:
http://www.trustcorgi.com/
And they will be able to assist you on-site and walk you through the workings of your system.
GasAid.co.uk
December 2006