SOURCE: I have a RENOVA boiler
You simply do not have enough water pressure inside your heating system and therefore the Boiler will not fire up. On your Control Panel, press the Bar/Mode button to display the system pressure... Then under the Boiler you will find a valve (On ours its a Blue knob), turn it anti-clockwise to let in more water, when the indicated pressure reaches that required by your system (On ours its 1.7 Bar) shut the value (Turn knob clockwise) - Then you can restart the system.
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