[ukha_d] Boiler / Wiring - Emergency response needed from a

[Chris Miles [mailto:chrismiles@xxxxxxx]]

The upstairs hot water boiler is working ok, but the downstairs
central
heating boiler is not working.

this is how the manual says the circuit works... although it does not
specify how to wire it
up when including a remote thermostat in the circuit (the thermostat
manual doesnt say either)

http://www.chrismiles.pwp.blueyonder.co.uk/therm1.gif
<http://www.chrismiles.pwp.blueyonder.co.uk/therm1.gif>

I understand this I believe (correct me if I am wrong)

HW = hot water
CH = call for hear

both of which have an ON and an OFF position.

And here is how it is currently wired.

http://www.chrismiles.pwp.blueyonder.co.uk/therm2.gif
<http://www.chrismiles.pwp.blueyonder.co.uk/therm2.gif>

First question:

the hot water works fine so I am assuming that the HW is working fine,
although I am confused to why
the live wire going upstairs is connected to the OFF terminal rather
than the ON terminal. I know this
was *definately* correct as the ON terminal is screwed right down and
has never been opened to allow
a wire in.

Second question:

I assume when the second relay kicks in and switches to the ON position,
current is sent up the yellow
wire to the "call for heat" terminal at the thermostat, should
this
yelllow wire connect into the L terminal
or the "call for heat" terminal on the thermomstat?

I assume it doesnt really matter what way round yellow and red are
anyway? Can I do this.

At the programmer... take the yellow as the switched live to the L
terminal on the thermomstat, then
take the red wire back up to behind the programmer and connect to the
red wire for the boiler using
a 13amp connector block just like shown on the picture ?

Third question:

The theromstat says it is essential to have a neutral connection, at the
theromstat the blue wire coming
from the programmer is connected to the N terminal, however at the
programmer it is not connected to
the other N terminal as you can see in the picture, and like I said my
father in law is absolutely certain
thats how it was wired.

Please help if possible

many thanks

Chris

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