I have the same boiler with a similar (not identical) problem.
It fires up ok...... all 4 lights, and heat being delivered.
Then at some point, the burner (rightmost) light goes off and heat is no longer delivered.
This state will continue either until the timer switches it all off, or until I notice that the rads are no longer hot. If I then switch the boiler thermostat (round knob) off and immediately on, all 4 lights come on and heat is delivered again.
Usually it will run ok for at leat an hour (often more) without the need for such intervention.
I haven't yet been able to find out what's causing this, and don't want to shell out for a Corgi/plumber.
The last Corgi guy I employed (boiler spitting and banging) didn't even spot that the pump had been wired directly to the timer (thanks to yet another Corgi guy), and therefore didn't get the 8-minute overrun which it would have had if wired correctly via the boiler.
So my impression of Corgi guys is that all you get from them is a large bill.
Can anyone out there help us with these problems.
MichaelCarts, December 2008
