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Yes, a little late from me. 2 zone valves a must. Have a look at the requirements for an auto bypass valve for the pump overrun.

Your expectations are correct. The boiler should be fed by a permanent live, neutral and earth from a fused spur. (if no heat is called for the boiler should still be on, not firing but on) A live, neutral and earth to the wiring center must also be taken from the spur. The wiring could have...

Hi Andy Its sounds like the room stat has been wired directly into the boiler as apposed to across the switched live. Does the central heating go off if the room stat is satisfied but the timer remains on. What type of boiler do you have?

[email protected]. Collyplumb

my address is [email protected]. drop me a mail and I can send it to you, thanks, Collyplumb

I can send you the manual. How do I get your email address? without us all receiving stuff from all over the web! if there is a metal strip covering only the rear 1/3 of the top of the boiler then this can be removed without exposing the HE.

Is there any space to get your head over the top and look down the back of the heat exchanger?

Hi, I have checked boiler manual and it says the expansion vessel sits behind the heat-exchanger. The only way I can see access if from the top of the boiler looking down behind the boiler. The worcester boschs have access from the top but I have not seen the Icon "live".

Sounds like you have already tried to balance the system... I will read the posts better next time. :oops:

Hi, I am not a regular on here so the others may come back with something better but.. Have you tried balancing the system? This means turning the lockshield valves of the radiators that are getting hot down to create resistance (not the Thermostatic Rad Valves) thus causing the pump to push...

OK but if this was the case then would water not continually run out the drain when only HW is circ with all the rads shut of. this would indicate the link.

right. the rads are getting warm from alt ends. L/S when HW call. TRV when CH call. 18 inches away stays cold. so it points to reverse. cool. but i have shut all rads and drained CH flow down. drain still open and i have can blow air through ch flow side. all while HW circulation is on.

I think you may be right. I'll give it a go. pretty much exausted all else. thanks for the help dave. sam you to. thanks.

I copied theirs but did go over it a couple of times to make sure it added up.

Hmm i have not had a very close look at cyl stat wiring. it is working well though. ie. turn, click, on.. turn, click, off ?? thanks though for sticking with me with this

Thanks sam. original was honewell so client got BG to replace but they changed to drayton. i thought (clutching straws ) this may have altered something so i fitted new honeywell. sort of cancelled out any incorrect wiring prob by fitting stopcock after 3port on CH flow and shut it to prevent...

hot as. when they still cold and open them with the HW calling the heat is coming from the reverse side (lock-shield as appose to TRV)

Thanks sam. yip 2 pipe system. client says all good before, easy to believe as its in a secure complex.. all houses are the same and we have done work in other houses and not had similar problems. just stumped

No that ones ticked off as well. got it in right way up. thanks

The T/Rs were all on the CH flow. still are. except for the on that i moved that i have no capped. thanks