I wonder any idea what would cause the boiler to stop modulating on central heating ??? just noticed that the boiler thermostat is in the usual setting on the boiler which is the twelve o clock area but the rads seemed to be hotter than usual , whilst monitoring i noticed that the boiler just seems to run constantly ???? where when last used early in the year it was definately modulating on and off.......you can induce modulation by turning the stat down to about the eight or nine o clock position but the rads then still don't appear any cooler which surely would be the case and also the boiler once it fires then remains on again , ive had no overheats which i would expect but maybe not ??........just a point to note that may help diagnosis ,when fitted i opted due to positioning etc to have no remote controls/stats so all functions are controlled from the boiler itself.
cheers
cheers