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Hi, I'm Mike and I have 20+ years of experience in the home improvement field. I'll be glad to assist you today.
Will you describe what the issue is that you are having with your circulation pump? Is it a hot water pump or radiant heat pump?
How many pumps are on the system?
Is your boiler providing hot water or only for heating?
So, on that zone the diverter is sticking open and the hot water pump is circulating the hot water through the zone. Do you know the model of the diverter?
No, the diverter diverts the water through the zones from the boiler.
There would be some sort of diverter but hard to tell from here without seeing the plumbing. Are you able to post any pictures?
I have to step out for a few. Dog has just notified me it is time for my walk. Will be back soon.
Post some pictures when you can. I will opt out for now and open to other experts.