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Well seems that you were sort of right & you get credit for pointing me in the right direction. There are 3 mircro switches on top of the diverter valve, and although the connections & wires are sound, one of the switches or it's mounting is suspect. Will investigate fully in the spring - in...

David Thanks for the explanation - seems to suggest the problem is not the diverter valve. The pump is circulating water through the heat exchanger just fine. The evidence for this is that the radiators are as cold or colder than outside because the heating has been running without any gas...

Hi David Thanks for your input - I was begining to think nobody loved me :cry: If it's the diverter value - can you explain how this tells the gas solenoid not to fire? I'm not sure I understand. Thanks

I've replaced the High temp sensor (on the LHS of the heat exchanger) and now I've got 2 clicks when I turn the big knob. :wink: But other than that the boiler is doing just what it did before - HW is fine, but the CH is just circulating the water through the exchanger with the extraction...

Well seems to me you could mount 2 towel radiators next to eachother and connect them in series to make up the 1000mmm width. But then your stuck with trying to acheive a 600mm height. Seems a little low to me, unless it's under a window or something. Cheapest option is to just mount a...

Hi Saunier Duval SD620/05F2 old as the hills. Was working generally OK until Sunday. Heating came on as usual, radiators warm, everything okaydokee. Then noticed room got cold and raditors very cold. The boiler was running but the the burner was not lit, pilot light was lit. Burner comes on...