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Halstead best 50 boiler cuts out?

I have a Halstead best 50 boiler. The ignition lockout keeps cutting the boiler out. I have had the circuit board changed, the fan replaced, I have insulated the ignition wires. any ideas?
simon Q, July 2008
The pump does run even after the ignition lockout light illuminates, the fan only starts if the boiler ignites, but because the fault is so random, it is very difficult to be able to detect whether there is an attempt to ignite or not.

simon q, July 2008
The pump does run even after the ignition lockout light illuminates, the fan only starts if the boiler ignites, but because the fault is so random, it is very difficult to be able to detect whether there is an attempt to ignite or not.

simon q, July 2008
The pump does run even after the ignition lockout light illuminates, the fan only starts if the boiler ignites, but because the fault is so random, it is very difficult to be able to detect whether there is an attempt to ignite or not.

simon q, July 2008
The pump does run even after the ignition lockout light illuminates, the fan only starts if the boiler ignites, but because the fault is so random, it is very difficult to be able to detect whether there is an attempt to ignite or not.

simon q, July 2008
give details of where in the ignition sequence it stops...

ie, doen pump run, does fan run, does aps click, do the electrodes spark.....and other details u can supply would help (what lights on boiler etc)

T, July 2008
link Click here to see other fixes for Halstead.