yep, lovely blue flames through spy hole!
all i have done with pump so far is whack it as my selection of screwdrivers wont shift the bit in the middle... although i will have another go when i have got a better tool for the job!
there are pipes everywhere ... i'm sorry but i dont have enough understanding to work out where things are going from & to!
you said 'the boiler should be hot after 5 mins of being ON' - do you mean that or 'the boiler should not be hot after 5 mins...' cos the boiler doesnt get hot, it just stops firing!
when i 1st put the new 3 port valve on, when i was testing it, the water did get hot, although when i turned the water programme off on the timer switch and called for CH the boiler refused to fire and nothing circulated through the rads... mmm perhaps it isnt getting the call for heat as you suggest!
ok, so my next plan of attack will be check that pump is turning, check for air lock (not just bleed rads?), check that sys not starved of water... although header tank seems ok (but it looks disgusting filth water in it to me! all rusty & what appears to be a limescale scum on top, lovely!) and if no joy from any of that check that boiler is getting the call for CH?
ps thanks everyone!