Boiler mate 2 with nest 3rd gen weird noise

Hi

I have a nest with boiler mate 2 and potterton boiler. All been working ok but one hour ago. Started making a clicking noise like a something switching on and off loudly vey very quickly. Maybe couple of times a second. Have a video but first time posting and need to find out how to upload it. Any help appreciated.

Just tried to add the link for the YouTube but as I'm new it won't let me.

Search boiler mate 2 going mad on YouTube and it might show.

There are various posts on forums that seem to indicate it is the pump control pcb that causes this sort of problem.

Thank you for your help. Would you think it's dangerous to keep the heating running with this issue? Just wondering if i can heat the house in the morning whilst kids getting ready and someone to come out and check etc.

Taking about pump PCB issues. When the heating comes on both pumps now switch on (heating and hot water) which does not normally happen. I think.

Taking about pump PCB issues. When the heating comes on both pumps now switch on (heating and hot water) which does not normally happen. I think.

Taking about pump PCB issues. When the heating comes on both pumps now switch on (heating and hot water) which does not normally happen. I think.