Hi all...help!!

So I have a wirless drayton digistat scr connected to a valiant boiler. The
thermostat is working (new batteries) and is telling the receiver to turn on
and off the boiler. Relay seems to be working inside the unit as I can hear a
click and green light appears.

I can't overright the boiler to force on with the top over right button (does
nothing).

When the thermostat gets to optimum temperature the green light goes off but
the boiler stays on.

Problem is we moved in recently so we will never know if it used to work
correctly.

What's your thought?



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On 29/04/2018 19:14, Adzb1 wrote:
Hi all...help!!

So I have a wirless drayton digistat scr connected to a valiant boiler. The
thermostat is working (new batteries) and is telling the receiver to
turn on
and off the boiler. Relay seems to be working inside the unit as I can
hear a
click and green light appears.
I can't overright the boiler to force on with the top over right button
(does
nothing).

When the thermostat gets to optimum temperature the green light goes off
but
the boiler stays on.

Problem is we moved in recently so we will never know if it used to work
correctly.

What's your thought?

Disconnect the stat from the boiler temporarily, and use a multimeter to
see if the actual instruction coming out of it matches the LED
indicators. It might be fore example that the relay contacts have fused
shut leaving a permanent demand for heat.


--
Cheers,

John.

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| Internode Ltd - http://www.internode.co.uk |
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| John Rumm - john(at)internode(dot)co(dot)uk |
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On 29/04/2018 19:14, Adzb1 wrote:
Hi all...help!!

So I have a wirless drayton digistat scr connected to a valiant boiler. The
thermostat is working (new batteries) and is telling the receiver to
turn on
and off the boiler. Relay seems to be working inside the unit as I can
hear a
click and green light appears.
I can't overright the boiler to force on with the top over right button
(does
nothing).

When the thermostat gets to optimum temperature the green light goes off
but
the boiler stays on.

Problem is we moved in recently so we will never know if it used to work
correctly.

What's your thought?



We need to know a bit more about your system. Does the boiler heat the
radiators *and* a cylinder for the domestic hot water? Are there any
motorised valves in the system? If so, how many, and what type - i.e. 2
or 3 port?

If you could post[1] a few photos showing pipe arrangements in the
vicinity of the boiler and in the airing cupboard (if you have one)
together with any motorised (zone) valves, we'll be in a better position
to help you.

[1] You'll need to upload then to somewhere like Flickr (unless you've
got your own website) and post a link here.
--
Cheers,
Roger
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Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.

Or perhaps it is via a thyristor and the break in the circuit required to
snap the scr out of conduction is not happening due to any number of things
in the circuit.
Brian

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This newsgroup posting comes to you directly from...
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"John Rumm" wrote in message
o.uk...
On 29/04/2018 19:14, Adzb1 wrote:
Hi all...help!!

So I have a wirless drayton digistat scr connected to a valiant boiler.
The
thermostat is working (new batteries) and is telling the receiver to
turn on
and off the boiler. Relay seems to be working inside the unit as I can
hear a
click and green light appears.
I can't overright the boiler to force on with the top over right button
(does
nothing).

When the thermostat gets to optimum temperature the green light goes off
but
the boiler stays on.

Problem is we moved in recently so we will never know if it used to work
correctly.

What's your thought?

Disconnect the stat from the boiler temporarily, and use a multimeter to
see if the actual instruction coming out of it matches the LED indicators.
It might be fore example that the relay contacts have fused shut leaving a
permanent demand for heat.


--
Cheers,

John.

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

on 30/04/2018, Brian Gaff supposed :
Or perhaps it is via a thyristor and the break in the circuit required to
snap the scr out of conduction is not happening due to any number of things
in the circuit.

The OP mentioned it being a relay in his text, but called it an SCR in
the subject line.

Harry Bloomfield submitted this idea :
on 30/04/2018, Brian Gaff supposed :
Or perhaps it is via a thyristor and the break in the circuit required to
snap the scr out of conduction is not happening due to any number of things
in the circuit.

The OP mentioned it being a relay in his text, but called it an SCR in the
subject line.

Would it not have been a triac anyway, passing ac?

In article ,
Adzb1 m wrote:
When the thermostat gets to optimum temperature the green light goes off but
the boiler stays on.

Problem is we moved in recently so we will never know if it used to work
correctly.

What's your thought?

My first one would be to find the installation manual for the boiler and
check the thermostat is suitable and correctly wired in. As, for example,
some boilers may use a temperature sensor rather than thermostat to
measure room temperature. Or give you the choice.

Most plumbers are plumbers, not electricians.

--
*When everything's coming your way, you're in the wrong lane *

Dave Plowman London SW
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