R
Rickster123
Time to get a gas safe engineer in then I'm afraid
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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?