Hi

I think I have a faulty room thermostat connected to our boiler. I have
tried to find where it is connected to the boiler (Vaillant VCW GB240H) but
cant find the connections anywhere.

The insuatlion on the cables is quite distinctive so its easy to distinguish
between that and any other cables. The only cables I can see are the
timeswitch.

Are the timeswitch and thermstat connected together to determine whether the
boiler should come on before the signal goes to the boiler or should there
be separate connections ?

Tim

In an earlier contribution to this discussion,
Tim Smith wrote:

Hi

I think I have a faulty room thermostat connected to our boiler. I
have tried to find where it is connected to the boiler (Vaillant VCW
GB240H) but cant find the connections anywhere.

The insuatlion on the cables is quite distinctive so its easy to
distinguish between that and any other cables. The only cables I can
see are the timeswitch.

Are the timeswitch and thermstat connected together to determine
whether the boiler should come on before the signal goes to the
boiler or should there be separate connections ?

Tim

They may well be wired in series - with a single connection to the boiler.
In any event, you would only want the heating to be on when *both* timer
*and* stat are calling for heat.

It is, of course, an ideal application for a programmable thermostat - which
combines a timer and a stat in a single unit.
--
Cheers,
Set Square
______
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Hi,

Thats the idea that Im moving towards, but Id like to know whether the
thermostat I have is faulty or not. Much easier to get the purchase req
signed off by the financial controller if there is a fault to fix !!!

Ill look again and see if I can find the thermostat cable connected to the
timeswtich rather than the boiler but I didnt find it last time I looked.

Thanks for the help,

Tim

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
Tim Smith wrote:

Hi

I think I have a faulty room thermostat connected to our boiler. I
have tried to find where it is connected to the boiler (Vaillant VCW
GB240H) but cant find the connections anywhere.

The insuatlion on the cables is quite distinctive so its easy to
distinguish between that and any other cables. The only cables I can
see are the timeswitch.

Are the timeswitch and thermstat connected together to determine
whether the boiler should come on before the signal goes to the
boiler or should there be separate connections ?

Tim

They may well be wired in series - with a single connection to the boiler.
In any event, you would only want the heating to be on when *both* timer
*and* stat are calling for heat.

It is, of course, an ideal application for a programmable thermostat -
which
combines a timer and a stat in a single unit.
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

Tim Smith wrote:

Are the timeswitch and thermstat connected together to determine whether the
boiler should come on before the signal goes to the boiler or should there
be separate connections ?

They may be joined... depends on how it has been wired. Is is a combi or
is there a hot water cylinder? If the latter the rooms stat may be
paralleled up with the cylinder stat at a junction box somewhere before
coming back to the boiler.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In an earlier contribution to this discussion,
Tim Smith wrote:

Hi,

Thats the idea that Im moving towards, but Id like to know whether the
thermostat I have is faulty or not. Much easier to get the purchase
req signed off by the financial controller if there is a fault to fix
!!!

Ill look again and see if I can find the thermostat cable connected
to the timeswtich rather than the boiler but I didnt find it last
time I looked.

Thanks for the help,

Tim

You can test the stat by bridging the live and switched live connections.
If the heating works when you do this - but not otherwise - (but with the
timer on, of course) that would indicate a faulty stat.

Another possibility is that the timer is duff - which may also justify
moving to a programmable stat!
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

In article ,
Tim Smith wrote:
I think I have a faulty room thermostat connected to our boiler. I have
tried to find where it is connected to the boiler (Vaillant VCW GB240H)
but cant find the connections anywhere.

The insuatlion on the cables is quite distinctive so its easy to
distinguish between that and any other cables. The only cables I can
see are the timeswitch.

Are the timeswitch and thermstat connected together to determine whether
the boiler should come on before the signal goes to the boiler or
should there be separate connections ?

If you have an external pump, the thermostat will usually just switch
that, with the line in being taken from the boiler live - ie after the
programmer.

--
*The most common name in the world is Mohammed *

Dave Plowman London SW
To e-mail, change noise into sound.

Its a Combi.

Tim

"John Rumm" wrote in message
...
Tim Smith wrote:

Are the timeswitch and thermstat connected together to determine whether
the boiler should come on before the signal goes to the boiler or should
there be separate connections ?

They may be joined... depends on how it has been wired. Is is a combi or
is there a hot water cylinder? If the latter the rooms stat may be
paralleled up with the cylinder stat at a junction box somewhere before
coming back to the boiler.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In message , Tim Smith
writes
Hi

I think I have a faulty room thermostat connected to our boiler. I have
tried to find where it is connected to the boiler (Vaillant VCW GB240H) but
cant find the connections anywhere.

Off the top of my head, between 3 and 4 on the connector block, but
check, I'm not certain


The insuatlion on the cables is quite distinctive so its easy to distinguish
between that and any other cables. The only cables I can see are the
timeswitch.

That's your only point of external control


Are the timeswitch and thermstat connected together to determine whether the
boiler should come on before the signal goes to the boiler or should there
be separate connections ?



--
geoff