after pressing the reset button, the boiler fires up for just a few seconds, then switches off again

paul houston, November 2016

It is difficult to help you without knowing the exact make and model of the boiler in question
Because not all boilers:
-Work the same way
-Have the same ignition sequence
-Have identical parts
The situation is similar to cars really
Would you expect the tyres from a go cart to fit onto a F1 car?

Mistified, November 2016

My potterton performa 24 won't fire up I have pressure but that's it

Mark, November 2016

yu know, there are many boilers. All are different.

Don't you think it would have been a good idea to let us know the make and model?

Actually, you COULD eveb try a Google search for yourself, once you know that info. You may even find folk who have had and solved the same problem.

Anon, November 2016