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of course, yep the htg would make the orange wire live if the HTG was on ONLY on its own - thus the grey would also be live. - so if i just had HTG OFF at the programmer would I still get a chance of a backread signal ?

why would the heating make the cylinder stat live? :?

can you please explain the need for removing wires 1 and 2 to avoid backread signals, as stated by swbjackson abve, is poss please?

sorry all i got it wrong - my fault i was looking at the wrong page!!! my apologies. what is all this about removing wires to prevent backread signals though-never heard of that before?!

no i hae a Y PLAN system - thats why i am quoting what i am - the common termianl is powered from the prog. and then the call termianl is powered when the hot water is calling from heat. sorry i am and i got it wrong - i was looking at an s plan!!! so sorry. the c termianl should...

seco - thats what i understand and how to do it, but the website said do not expect a faulty cylinder stat unless the common (C) terminal/from the programmer is not live when hot water is being called for. which doesn'tmake sense does it? if the common (C) terminal was not live when HW was...

wish mine had - so basically i need a permanent live from the wiring centre to the frost stat, a wire from the frost stat to the pipe stat, a wire from the pipe stat then goes to the orange wire of the 3 port (as i have a 3 port).

its an old baxi. nt built into mine. do you mean new boilers have frost/pipe stats built in, or like a device that turns the boiler on when the temperature in the room gets to a low level - like a built in frost stat? i want to fit mine, hopefully tomorrow morning.

Hi I was about to fit a frost stat and now have a problem with my cylinder stat! for some reason it is not heating up the water in the cylinder. the programmer is on and the heating works fine as normal. i was presuming the cylinder stat was stuck and not claling for heat. but am a...

sorry .... am back again! so basically i need to buy a pipe thermostat too! and wire this to the frost stat and the pipe stat to the orange wire of the 3 port?

Can anyone help me please: I have brought a sunvic frost stat and want to wire it up to my system so it activates when the temp drops low. (will be in the loft space, which is more or less directly above the wiring centre which is in the airing cupboard). The problem is wiring it in...

could be a fortec type combination hot water tank and cold water tank on top. where is the leak coming from? is there a drain valve near the bottom of the hot tank, maybe round the back somewhere.... unvented cylinders don't have a ball valve, they are usually mains pressured, if not then...

sorry one last point ... why would the boiler heat exchanger get scaled up over time? i don't think fresh water gets into the system that often? perhaps over the years though? although the system has had inhibitor in it always.... ??

ok thanks ... after replacing the rad valve i can do this at the same time!

the system I have is open vented ... does this make a difference? MT washers? what are these... do normal stores like wickes sell these or a plumbing shop??

I have another query that I'd like to ask the pro's if I may please?... Basically when my boiler is first fired up, banging type noises (not too loud but quite annoying) are heard and last for quite a while ... they seem like they are coming from the boiler casing.... - but the hot water...

:o you'd let your apprentice do this in someones house!!!!! :D

snatch it... ? do you mean replace it wet?!!!!!

Thanks I will do that - I take it all drain off washers are similar in size and will fit most types!! :) Am I likely to get wet though ...... One other point: what is the advantage of having a drain off near the boiler? is it to do with quicker re-filling due to air, etc?

Thanks for the tip - will a new drain vale innards be standard size? or are there different types? If I take the innards out, and the washer is stuck/welded on the seat, and i get it out, will the water shoot everywhere though? .... I have been using grips to nundo the rad vale spindle...