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they were warm but now they are very hot . so it looks like its working with out the stat , no bleed vent . i have reconnected the stat to see if it go's back to the way it was , if so i will change the stat . do you agree with this ? thank you for all your advice Dave

still nothing . boiler kicks in then off a few seconds later . air lock ?

No its been going on for a while . ill give that a try and see what happens . thanks for all your help just removed the stat . behind is copper but its not very warm to touch. ill leave it half an hour and see what happens

cyl stat (on out side of cylinder) dose not click , its very hard to turn . boiler kicks in then cuts out shortly after

its an unvented system . it has a tank in the loft that feeds the heating system and a tank that feeds the hot water cyclinder however it has got a solar system connected to it that is not in use , this has an expansion tank connected to it as well cylinder is 166 ltrs max head 10m...

the hot water is only warm not hot . i think it has seized , ive had to free it a few time befor .got sick of doing this so changed it . dont know if the stat was satisfied . the stat is set to 70

when you switched the controls form heating only to heating and hot water nothing happend on the valve ( it didnt move) i tried it several times and nothing happend , when i installed the new one you could hear it moving and the hot water pipes got hotter the usual

Hi i have an unvented system . the heating is fine but the hot water was not working , i checked the 3part valve and it was not working so i changed it . but the water is still not getting very hot . could it be the cylinder stat that needs changing ? cheers

John ive sent you an email to explaine in more detail . hope you dont mind :D

its in quite a new building . the orignal fitters number is on the cylinder do you think we should get them to come back and put it right ? is it dangrouse at the moment ? thank you for your advice :D

thanks for your reply , can you explaine what you mean by prv and a tprv . thanks

Hi Can any one help me . im looking at an un vented hot water cyclinder the kind with an expanshan tank connected to it and it keeps over flowing into the tundish . any ideas what could be causing this ?[/img]

cheers :D

Hi Just a quick question , im in the porcess of re piping the supply in our utilty room . i would like to know is , is there anything i need to do to the plastic 15mm pipe that im going to run between the plaster bord and the brick work. do i need to run it in trunking or can i just clip it...

still no joy :(

been back today . turned off all the rads and ran the boiler with the temp turned up . ill see what happens

any one ?

hi back again been round this afternoon. i did what i was advised to do ie turn down water temp on boiler , close all rads bar the ones that don't work and run over night. today the two problem rads where luke warm when i got there so i turned the temp up and not a lot happened . i have re...

calm down dears ha ha . gonna try this later today i will report back . thanks for all the help :D

i will give that a go but one of the rads has no trv as its in the hall next to the stat oh and it seems that the trvs are on the return sides of most of the rads . it was fitted by a goverment scheme to keep the elderly warm