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Thanks. I've replaced the stat with the Potterton model the supplier said, so all works fine....... except that whenever I put the hot water on, on it's own, the radiators come on as well ????

The existing Potterton room stat has stopped working, and when the radiators come on they are boiling hot.So when I\\\'ve gone to replace the stat, I\\\'ve noticed that the existing one , as well as live & neutral, has a H for heating, which my replacement does not have, it just has a terminal...

The last two weeks I've noticed the radiators come on, as programmed, very hoy indeed. The boiler is Potterton, as is the room thermostat, which has two indicator lights, one for temperature under, and one for temperature achieved. These lights do not come on at all when the radiators are...

Thanks, I think you might be right about the condensation, as the all the nails have exactly the same size drips, and it hadn't rained for days.

The nails protruding about 1/2 inch thru the roof felt in the loft all had drops of water coming off them, although at a very slow rate. It hadn't rained for about 4 days, the roof was replaced about 10 years ago, there is insulation to the loft floor, but none between the roof joists, jest felt...

Thanks everyone for their contributions. I (thought ) I had checked everything,over and over again, but after some of your comments I checked again. It turns out the emersion was on 27/7, for at least 18 months, so not only was I getting boiling hot water, I was also paying thru the nose...

Thanks for that. I don't think it is sludge, as the water coming out of the radiators was clear. What is a DHW sensor ? The honeywell thermostat in the kitchen has two lights, one for temp reached and one for temp below, so I think this is working OK. I can't understand that when I...

HW comes on fine, though it is very hot indeed, even with the therostat on the HW tank turned to minimum.No heating at all,timings set OK, room thermostat turned on, pump seems to work, as when the screw is turned you can hear the water moving in all rads. Bleed rads, clear water coming out...