I have a Ideal Icos boiler in my home which is used for hot water & the

central heating which incidentally is a unfloor heating system.
Since the past couple of days the boiler does not fire up for the
central heating.
The UFH system looks to work perfectly fine & there is a proper water
circulation and all usual trouble shooting techniques with UFH does not

reveal any issue. Assuming the UFH system is working fine, I am
struggling to find out why the boiler does not fire when the Central
heating demands it.

Hot water is available whenever required and boiler only fires up for
it.


Could someone please help?