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Thanks also to everyone else for their help and idea,s best regards, hope i can help anyone else i future.

Hi,heytesto, your a star, it was only when you said that i realized, i must have looked at the drawning 20 times, when you said that ! irealized i was checking the micro sw. and not the wiring, boiler perfect, just goes to show how easy it is to make a mistake. Thanks again for your help &...

micro switches are the right way, yes first problem ok, that,s why i thought the differential pressure sensor, have you experienced this ?

Hi, the primary diaphram lifts and falls with demand, but the boiler doesent fire, when you also lift the dhw diaphram micro sw. then the boiler fires

hI Dave, that,s what i replaced a service kit alpha parts for the DV?

hI Dave, that,s what i replaced a service kit alpha parts for the DV?

Hi Dave changed the domestic diaphram, and the primary diaphram which comes with daiphram, new spring o rings etc regards denis

Hi guys, can anyone help, i have a alpha 240x, and the dhw was passing over to the heating, changed the domestic diaphram and the full kit on the c.h. side. now when you run the boiler on ch demand , the pump runs the diaphram lifts but the boiler doesent fire, if you lift the dhw micro sw. the...

No, allthough when cables changed from imperal to metric sizes , insulation on domestic cables started to change to pvc, however rubber insulation is still in use today TRS also as butyl rubber insulated which is very high temperature cable, also some tri- rated panel wiring is butyl TCP. For...

The previous imperial cable sizes were 1.044 ie normaly called Bell wire 3/ 029 now 1.0mm 3/036 now 1.5mm 7/029 " 2.5mm @ so on 7/036 7/044 7/052 etc then on to 19/ 044 Hope this is some help :)

I never sujested for one moment that you should never work only to minimum standards and I,m glad to see you don,t however, that was not the question. the question was, ( is it permissable to use 1.0mm T&e for a domestic lighting circuit,) the answer is simply yes. :lol: :lol: and good...

It,s ridiculous to say we never use 1.0mm cable, as the size of cable used in any circuit is dependant on the load and the cable used. while it always aviseable to allow for a small further developments, it only practical to use your common sense in accessing further expansion. if the circuit...

quite right, that is friction burns caused from the movement of the floorboards, if your central heating pipes are hot enough to burn the cables, believe me there,s somthing wrong with your central heating. also there wood be burn marks on the floorboards. but your first action should now be to...

use the old fashoned method, used before rawlplugs, just take a piece of wood and shape it as tapered diamond, hit it into the wall untill tight, then cut off surplus level with the surface. screw to centre. denisthedolphin

Thanks all for the info, I am a retired marine electrical engineer. I just moved and inherited this boiler but there was no info with it, but understand D/V is a common fault with this model. If i decide to change boiler, any recommendations for trouble free units to exchange with.

ok thanks dave

Thanks dave any idea how i can get hold of a service manual for this model?

why do all my radiators get warm when i'm running the domestic hot tap,and the boiler is set for water only