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i was reading a CH book and it said this: closing both isolation valves to the pump. remove the pump vent screw at the front slowly open one of the isolation valves (the higher one) if water pours through then the bearings are wron and a new pump is needed by why would...

interesting info. thanks d-hailsham. so obviously the modern stats (or digistats) without an anticipator do not need the neutral wire as the thermistor is battery operated or mains operated, ie from the common terminal?

i have changed rad alves / tails before and usually most are 1/2" - with the trv being fitted to 15mm diameter pipes. but if your old tail is 3/4" to 15mm pipe then yes change the tail as well as the valve!!!

yep that's right - so basically the air vent being on the flow means less chance of air being drawn into the system, through micro leaks, etc?

Hi people: i have a few quick questions (probably really easy for you)! about heating that i am not 100% sure about and would like any further help/information on from any top plumbers/heating engineers if i may?: 1) why are air vents (usually on the primary flow to the h/w cylinder, tee'd...

hi- today i bought a new honeywell mot valve - and am going to be fitting it in an hour or so. as i have the sentinel x400 sludge remover to be added to the system, should i replace the valve now or in a week's time? what would be best? also, will it be possible to change the valve by...

if orange has 100v live when both h/w and heating are satisfied then the pump and boiler will still be on (orange live means pump and boiler live). Also if grey only live + 100v on orange as you say (held in last position if both hw and htg sat but programmer still on) does the grey staying...

thanks seco - i will use sentinel x400 tonight (from the mighty b & q)! and order up a new valve from screwfix. one last point: you say grey only is valve held in last position (eg when h/w and heating both satisfied but programmer still on, but is there any voltage to orange whilst this is...

seco thanks for clearing that up - also is this true: when programmer time switches off power (eg at 9am), the valve returns to it's rest position (usually h/w port open) and )o voltage to any of the wires (obviously)! :_

seco-thing is when hot water is on only (on its own) it is fine and no heating is on (sound white is not live obviously). so maybe the valve isn't returning properley to its rest position after having both h.w and heating on together? maybe the spring is knackered or some crud has got into...

sorry, grey white and orange live mean heating only, white and orange live mean hot water and heating, orange live means hot water only. this is correct i think! :)

and likewise when hot water and heating on the grey wire is also live (as the valve moves into mid position) so they micro switches inside it put power to grey as well..

yes that is correct. basically when both are on it is fine, then when i push the ovveride on the programmer to just hot water on (so heating is switched off) they both still stay on)! ... why's this?

when heating is calling only (on a motorised alve-honeywell v407) the white wire will be live (from the room stat making) and then the motorised alve motor moves across and makes the orange wire live (which is also connected to the same terminal box as the live for the pump and boiler). this...

hi seco- when i have heating on only or hot water on only it is fine, both do not come on then, it's very strange i know! also in general the heating takes longer to heat up and yes i suppose they do feel slightly cooler at the bottom. but when i bleed them water comes out: this is...

Hi all... I have 2 heating problems (queries) that I would like your advice on if I may. 1) The heating is taking a little longer now to warm up. The cold feed pipe from the feed cistern is not blocked as I have checked this and drained water and it re-fills. Could it be scale/sludge...

Ok try the heating on now and see if it works with the sensor head off? ..

Thanks seco - that looks prefect - the right size for my cistern, and the collapsable silencer tube makes filling even quieter! Will order one today! :) Thanks for your help and advice.

Hi seco, thanks for the quick respone. I haven't put a new torbeck in, just a normal plastic type (part 3 ) valve from B & Q! Was under a fiver!! I was looking at fluidmaster valves but they seem too big for my cistern, especially with the box type filling mechanism at the bottom. I...