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Posted: 2023-01-1506:31 AM. Last Modified: 2023-01-1506:33 AM
Normally, the Hubᴿ activates a zone valve which, in turn, activates the boiler and pump when it opens. The state of the boiler itself isn't known (Opentherm could muddy the waters?) - but the RelayState is accessible via the API. However, you say it happened before Wiser was installed, so it sounds like something external anyway.
Is the boiler in a 'cold' location, protected by a Frost-stat? The weather's just turned cold again, so maybe that is triggering it? (Frost-stats are adjustable, but you may have to remove a cover first).