pump running continuously

Hello Mike, We have a Boiler Mate II
I wrote earlier this year and just got around to replying to your reply. It was regarding the boiler pump that's always running. In replies to other members you said the cause was probably a dodgy pump delay timer PCB. If this is the likely cause, can you confirm the correct term for this part and if this part is easy to get hold of, should it be replaced with anything else at the same time? Also assuming new part(s) are to be ordered, where is the best place to get them from, and is it easy to remove the old and replace with the new parts.

thanks in advance

Matthew