Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the hot
water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR shows
a steady green light indicating that the heating should be running. At
the same time however the connections on the SCR which should be
connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and the
heating to run normally.

Connections to the wallplate are fine and the pins that connect the SCR
to its wallplate appear OK.

Time to replace the SCR?
Is this one known to be unreliable?
Any alternative suggestions for a basic wireless thermostat?

TIA for any replies.

"Invisible Man" wrote in message
...
Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the hot
water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR shows a
steady green light indicating that the heating should be running. At the
same time however the connections on the SCR which should be connecting
are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and the
heating to run normally.

Connections to the wallplate are fine and the pins that connect the SCR to
its wallplate appear OK.

Time to replace the SCR?
Is this one known to be unreliable?
Any alternative suggestions for a basic wireless thermostat?

TIA for any replies.

Having fitted hundreds of remote stats I would say that the Drayton is about
the most reliable.

I believe that I have a spare SCR knocking about in my van if you want it.

Adam

On 22/02/2010 11:24, ARWadsworth wrote:

"Invisible Man" wrote in message
...
Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the
hot water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR
shows a steady green light indicating that the heating should be
running. At the same time however the connections on the SCR which
should be connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and
the heating to run normally.

Connections to the wallplate are fine and the pins that connect the
SCR to its wallplate appear OK.

Time to replace the SCR?
Is this one known to be unreliable?
Any alternative suggestions for a basic wireless thermostat?

TIA for any replies.

Having fitted hundreds of remote stats I would say that the Drayton is
about the most reliable.

I believe that I have a spare SCR knocking about in my van if you want it.

Adam

Many thanks for the offer. I sent pretty much the same as I posted here
to Invensys customer care and they have offered to replace it without
seeing or testing it. Can't say fairer than that. In the meantime I had
bent the sockets on the wallplate to ensure better contact with the pins
on the SCR and at present the unit is working fine.

"Invisible Man" wrote in message
...
On 22/02/2010 11:24, ARWadsworth wrote:

"Invisible Man" wrote in message
...
Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the
hot water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR
shows a steady green light indicating that the heating should be
running. At the same time however the connections on the SCR which
should be connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and
the heating to run normally.

Connections to the wallplate are fine and the pins that connect the
SCR to its wallplate appear OK.

Time to replace the SCR?
Is this one known to be unreliable?
Any alternative suggestions for a basic wireless thermostat?

TIA for any replies.

Having fitted hundreds of remote stats I would say that the Drayton is
about the most reliable.

I believe that I have a spare SCR knocking about in my van if you want
it.

Adam

Many thanks for the offer. I sent pretty much the same as I posted here to
Invensys customer care and they have offered to replace it without seeing
or testing it. Can't say fairer than that. In the meantime I had bent the
sockets on the wallplate to ensure better contact with the pins on the SCR
and at present the unit is working fine.

A much better response than I got from Salus when a brand new unit would not
work.

They could not even reply to my messages.

Adam

[Default] On Sun, 21 Feb 2010 17:24:16 +0000, a certain chimpanzee,
Invisible Man , randomly hit the keyboard
and wrote:

Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the hot
water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR shows
a steady green light indicating that the heating should be running. At
the same time however the connections on the SCR which should be
connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and the
heating to run normally.

Connections to the wallplate are fine and the pins that connect the SCR
to its wallplate appear OK.

I can't answer your question, but you have raised one in my head.

My mother's central heating is doing what you describe - tankfuls of
hot water but intermittent heating. Hers has a Drayton wireless room
stat, which I fitted about five years ago.

We (me and the '24-call-out' central heating cover numpties) have
replaced 2 x syncron motors and a complete 3-way valve head unit to no
avail, until two weeks ago I took the receiver off & noticed what
could have been a loose wire on the call for heat connection. Eureka,
I thought. So I tightened the connection & thought I'd fixed it.
However, she reported that one day the house was cold. Now, my mother
is 85, with a mind as sharp as a sponge, and doesn't have a clue about
anything invented after Churchill was a lad, so she's not the most
reliable of witnesses.

I had dismissed the thermostat, as, like yours, the green light is on
when it's calling for heat. I need to check with her if it's still
working as it should, but your post has given me food for thought if
it isn't.
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have I strayed"?

On 24/02/2010 21:25, Hugo Nebula wrote:
[Default] On Sun, 21 Feb 2010 17:24:16 +0000, a certain chimpanzee,
Invisible , randomly hit the keyboard
and wrote:

Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the hot
water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR shows
a steady green light indicating that the heating should be running. At
the same time however the connections on the SCR which should be
connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and the
heating to run normally.

Connections to the wallplate are fine and the pins that connect the SCR
to its wallplate appear OK.

I can't answer your question, but you have raised one in my head.

My mother's central heating is doing what you describe - tankfuls of
hot water but intermittent heating. Hers has a Drayton wireless room
stat, which I fitted about five years ago.

We (me and the '24-call-out' central heating cover numpties) have
replaced 2 x syncron motors and a complete 3-way valve head unit to no
avail, until two weeks ago I took the receiver off& noticed what
could have been a loose wire on the call for heat connection. Eureka,
I thought. So I tightened the connection& thought I'd fixed it.
However, she reported that one day the house was cold. Now, my mother
is 85, with a mind as sharp as a sponge, and doesn't have a clue about
anything invented after Churchill was a lad, so she's not the most
reliable of witnesses.

I had dismissed the thermostat, as, like yours, the green light is on
when it's calling for heat. I need to check with her if it's still
working as it should, but your post has given me food for thought if
it isn't.
Invensys have offered to replace the SCR in my case. In the meantime I
have used a screwdriver to bend the connectors on the wallplate so that
they will be tighter against the pins on the SCR. All working fine at
present.

"Invisible Man" wrote in message
...
On 24/02/2010 21:25, Hugo Nebula wrote:
[Default] On Sun, 21 Feb 2010 17:24:16 +0000, a certain chimpanzee,
Invisible , randomly hit the keyboard
and wrote:

Drayton Digistat RF1 and SCR fitted last March.

Recently the heating has failed to come on from time to time but the hot
water is fine.

Investigations reveal that the RF1 is calling for heat and the SCR shows
a steady green light indicating that the heating should be running. At
the same time however the connections on the SCR which should be
connecting are open circuit with 240v across them.

A couple of sharp taps on the SCR causes the connection to make and the
heating to run normally.

Connections to the wallplate are fine and the pins that connect the SCR
to its wallplate appear OK.

I can't answer your question, but you have raised one in my head.

My mother's central heating is doing what you describe - tankfuls of
hot water but intermittent heating. Hers has a Drayton wireless room
stat, which I fitted about five years ago.

We (me and the '24-call-out' central heating cover numpties) have
replaced 2 x syncron motors and a complete 3-way valve head unit to no
avail, until two weeks ago I took the receiver off& noticed what
could have been a loose wire on the call for heat connection. Eureka,
I thought. So I tightened the connection& thought I'd fixed it.
However, she reported that one day the house was cold. Now, my mother
is 85, with a mind as sharp as a sponge, and doesn't have a clue about
anything invented after Churchill was a lad, so she's not the most
reliable of witnesses.

I had dismissed the thermostat, as, like yours, the green light is on
when it's calling for heat. I need to check with her if it's still
working as it should, but your post has given me food for thought if
it isn't.
Invensys have offered to replace the SCR in my case. In the meantime I
have used a screwdriver to bend the connectors on the wallplate so that
they will be tighter against the pins on the SCR. All working fine at
present.

And the offer applies to Hugo about the spare SCR I have.

Adam

[Default] On Thu, 25 Feb 2010 17:01:15 GMT, a certain chimpanzee,
"ARWadsworth" , randomly hit the
keyboard and wrote:

And the offer applies to Hugo about the spare SCR I have.

Thank you for the offer.

I'm touching wood (*) at the moment that it's running reasonably well.
We need to get the whole system overhauled sometime during the summer
(like it should have been when Wyatt Earp replaced the boiler 5 years
ago); flush the radiators, replace the programmer & install a
hard-wired programmable room-stat, not leave the wiring box somewhere
completely inaccessible behind the cylinder, etc.

Anyone know anyone reliable in Liverpool?

(*) Oo-er missus!
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have I strayed"?

"Hugo Nebula" abuse@localhost wrote in message
news
[Default] On Thu, 25 Feb 2010 17:01:15 GMT, a certain chimpanzee,
"ARWadsworth" , randomly hit the
keyboard and wrote:

And the offer applies to Hugo about the spare SCR I have.

Thank you for the offer.

I'm touching wood (*) at the moment that it's running reasonably well.
We need to get the whole system overhauled sometime during the summer
(like it should have been when Wyatt Earp replaced the boiler 5 years
ago); flush the radiators, replace the programmer & install a
hard-wired programmable room-stat, not leave the wiring box somewhere
completely inaccessible behind the cylinder, etc.

Anyone know anyone reliable in Liverpool?

(*) Oo-er missus!
--
Hugo Nebula


Well if Barnsley get promoted I could do the electrics before an away game
at Anfield or Goodison Park.


I suggest that you try the Invisible Mans suggestion of squeezing the
terminals together first, then email me if you need the SCR.

Cheers

Adam