Thorn Apollo Boiler - Banging/cutting our

Hi
Anybody help me, I have just moved in to a new house with a Thorn Apollo boiler and tho it worked fine before I turned it off for the summer, having turned it back on - I get nothing but banging and cutting out.

I have rang a plumbers - 3 week waiting - but would like to get the problem solved, they suggest it may be the pumb, but having almost ripped the house to bits I cannot find the pump - could it be inbuilt?

Any advice would be appreciated.

Thanks
Sam

have seen them on them on top of the boiler in a box

... and we've all seen them under the middle of the dining room floor, left over from when there was a back boiler ...

Try following wires from the boiler

bit like filling loops then