What the manual says
Manufacturer manualHeating mode is switched OFF
From this model's manual
Verified against the Vokera/Vokera Hydra installation & service manual.
DIY fix possible
Locate the mode selector or display panel on the front of the boilerPress the heating button or adjust the winter/summer mode setting to enable the central heatingIncrease the temperature setting on your connected room thermostat to trigger a demand for heat
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All 50 fault codes on the Hydra
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