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LOL - yeah, i'd put an extension on that vent pipe and a hole in the lid, you can see where it has at some point pushed something out and stained the lid already ... No overflows at all !! - not a good idea, if the store tank is fitted with a full bore high flow valve, and it gets stuck open...

no its ok, as it could do with an inspection by a qualified fitter anyway to make sure there isnt any other issues i'll get someone in to do it. i can get the valve myself as its a standard honeywell part (stupid thing is i swapped about 6 of those diverter valves for 4 of the simple zone...

ok - the valve has issues ! the manual lever is loose for about 85% of its travel on first inspection. firing the boiler up in HW mode results as before in the rads heating up - with the valve head cover removed, manually forcing the actuator arm closed solves the rad heating issue...

not sure - going to try and look at that now and using the manual slide lever on the diverter valve see if the valve is stuck open, if it is, then the manual lever should be loose and move with no restriction - but i have to strip the covers off the boiler to get to it

ok, confirmed.... with everything turned off, thermostat, boiler at its switch at the bottom and the system cold.... the pump is running :?

ok, second test results, still with the boiler set to HW only waited for a while to ensure boiler main burner was not on and Rads cooled off. before drawing off HW, but before i did i checked to see if any pump activity could be heard - none, so pump seemed to be off turned on hot tap, and...

ok, answer to your question... Boiler on in HW mode only switching on caused the boiler to fire up as expected, main burner came on - presumably for the pre-heat mode - Radiators heated up too, somewhat slowly though, but got fully hot - no HW drawn off the system at this point. waited...

ok thats weird .... just went and made sure the room stat was set to off - it is, and the boiler was set to HW only - it was .... and it was also turned off at the switch next to the HW/CH control selector ... and the pump was running :o :shock: turned the boiler on and it's fired up as...

not sure, that is something i did not test. i will go and have a look see, i assume if i leave the room thermostat disconnected, that when i switch the boiler on from cold the hot water pre-heat will fire up as its stone cold, this, unless i am thinking wrong should NOT turn on the CH...

ok guys, please bear with me as i have not posted here before, and if i have missed any information needed please let me know. Problem - basic Boiler seems to have gained a mind of it's own, running central heating when nothing is calling for heat. setup NF80 Combi Boiler performing HW...