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Take it all controls are calling for heat ? Room stat turned up, on at timer etc.,
turn the filling loop off and its too full needs to be around 1-1.2 bar to get the pressure down bleed a rad
Have you pressed the reset button ???
0 is boiler has no demand. Icos is a heat only boiler not a combi. If display does not change to c then boiler is not getting a demand. Faulty external controls. Get someone in to check. A better picture would help
It's the honeywell control known for relay faults when green light comes on does it click if not phone them they have 5 year warranty on these due to this fault. Done a few. Unusual for both to go though hu
What is your room thermostat set to?
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