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Are you using a Nest with OT? If so, True Radiant needs to be enabled on the Nest for it to set the flow temp. On the Vaillant you can also see the ebus target temp (D.9 on the EcoTec Plus 624) (flow temperature requested by the Nest) in the settings to see what is being sent. Mine is definitely modulating down. If it has a large temperature difference it will fire at max set temp (75 in my case) and modulate down as it approaches the target room temp (44 at present).
The ebus connections should not be joined to my knowledge.
The ebus connections should not be joined to my knowledge.
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