Boiler switching off

[ColdMartin]

I have Glow Worm FuelSaver 35F.
It ignites OK but after a couple of minutes it switches of (the over heat cut off does not trip). When left for ten minutes the boiler re-ignites and the process is repeated.
Any ideas how to resolve the problem would be much appreciated.
The pump, fan, valve all operate correctly.

 

[Boilerman2]

Bloody good service should be a good start, get a RGI to have a look

 

[namsag]

IS fan still going when it drops out
see if 240v is still at gas valve. if it is it is solenoid breaking down under use .

 

[ColdMartin]

Fan cuts off.
No voltage at soleniod

 

[namsag]

To make sure external controls are not faulty when it goes off see if you still have 240 coming in on the switched live. If 240 still there you are probably looking at a circulation problem as opposed to boiler problem

 

[ColdMartin]

Thanks for help but problem has been found.
The fan stops after a couple of minutes even when connected directly to the mains.
The system was correctly detecting a pressure failure and shutting down.