Hello Mate..
Have you had it apart at all ???
Try checking that the bolt pin is engaged with the rammer slot, also do a couple of things to ensure that all parts are nicely lubed..
Take the LPR Cap off and lube internals , do the same with the Inline Reg..
Then check the dwell settings mate..
Also maybe check that its not on training mode first ..
If all the above fail give me a shout..
Also check battery..