My boiler ignites, when the thermostat calls for heat, stays alight for a few minutes and then goes out and then re ignites.
This continues all the time without getting up to proper temperature. The system was working correctly until recently.
All lights show correctly, the boiler seems to think it is up to temperature when it is not.

Alan B Richardson, April 2005

I have no power lght on my Baxi solo PLF 50, you can hear the board click when I turn on the fused spur.
But I get no boiler light when I turn the boiler stat up.

Any Ideas

Malcolm, April 2009

I did find a solution myself. I found that the small plastic elbow, in the air pipe between the flue fan and the pressure switch, was broken, letting air out of the pipe and causing the switch to shut the boiler down.

Alan B Richardson, April 2005