We have one circulator pump and three zone valves. Each fall at least one of the 2nd floor zones is air bound and hot water either will not circulate at all or very slowly.
It is a simple matter to purge each zone on our system so I do it myself. In the beginning I asked the service tech to trouble shoot it during annual service, as AW has suggested. He then showed me how to purge a zone. Even if this is not your current problem, in the future it can be a first action prior to deciding to call for service
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