It's that time of the year - old and the heating is playing up!
We have Danfoss FP715 CH controller. The boiler is gas and it's a separate
boiler with the hot cylinder in the airing cupboard.
No problems at all with the hot water. Set the water on on the controller
and we get hot water. Set the CH on on the controller and we get cold
radiators! Have CH on and water on on the controller and we get warm
So basically the central heating doesn't work without the hot water being
on. The boiler doesn't fire and the pump doesn't seem to come on either. I
have a suspicion that when the hot water is on and CH on together that the
heating isn't as efficient as it used to be (though that may just be my
imagination). The whole installation is just over two years old.