Hi all ,, again!

Earlier today i had to turn my boiler off at the FCU as the tank was
really clanking and thudding (started suddenly )(I think its the sound
that you get when there is air in the system). I heard this once
before, and once a bleed screw was opened to release lots of air it
was fine.

I opened that same screw just after the noise and only water came out.

Any way I realised that the rads were realy hot and turned the knob
right down on the boiler (potentiometer) and turned the FCU to on
again.

The boiler never fired up as i had turned it down but lights came on
(cant remember which ones)

that was 2 hours ago,, now no lights are on whether I turn
potetiometer up or down, bolier wont fire up and there is a distict
lack of life.

when i turn FCU on, the timer operates and i hear a fan humming from
within the boiler casing?? but thats the only sign of life.

The noise was alarming and it seemed that the pipes were shuddering
with the force.

In January I changed the Fan and the Pump as both died within a day or
so of eachother. the system has been fine since then up untill now.

Any guidance appreciated.

Andy

SORRY

I just went upstairs and tired the boiler. It seems to be fine now???

Can it cut out if it overheats?

What was the noise?

Did it over heat? the water in rads was (seemed !) hotter than normal
..

Hope you read this before you reply to original header.

I will watch for the next hour or so and see if i get that sound
again.





Andy

In message , Andy pandy
writes

Hi all ,, again!

Earlier today i had to turn my boiler off at the FCU as the tank was
really clanking and thudding (started suddenly )(I think its the sound
that you get when there is air in the system). I heard this once
before, and once a bleed screw was opened to release lots of air it
was fine.

I opened that same screw just after the noise and only water came out.

Any way I realised that the rads were realy hot and turned the knob
right down on the boiler (potentiometer) and turned the FCU to on
again.

The boiler never fired up as i had turned it down but lights came on
(cant remember which ones)

that was 2 hours ago,, now no lights are on whether I turn
potetiometer up or down, bolier wont fire up and there is a distict
lack of life.

when i turn FCU on, the timer operates and i hear a fan humming from
within the boiler casing?? but thats the only sign of life.

The noise was alarming and it seemed that the pipes were shuddering
with the force.

In January I changed the Fan and the Pump as both died within a day or
so of eachother. the system has been fine since then up untill now.

Any guidance appreciated.

It's broken ...

































Has the over heat stat tripped ? if you have air in the system, it might
have tripped

If you look on the pcb, there's a 2 pin connector called o/h

trace it back to the overheat stat, it has a reset button on it.
--
geoff

On Thu, 10 Mar 2005 17:50:22 +0000, Andy pandy wrote:


Hi all ,, again!

Earlier today i had to turn my boiler off at the FCU as the tank was
really clanking and thudding (started suddenly )(I think its the sound
that you get when there is air in the system). I heard this once
before, and once a bleed screw was opened to release lots of air it
was fine.

I opened that same screw just after the noise and only water came out.

Any way I realised that the rads were realy hot and turned the knob
right down on the boiler (potentiometer) and turned the FCU to on
again.

The boiler never fired up as i had turned it down but lights came on
(cant remember which ones)

that was 2 hours ago,, now no lights are on whether I turn
potetiometer up or down, bolier wont fire up and there is a distict
lack of life.

when i turn FCU on, the timer operates and i hear a fan humming from
within the boiler casing?? but thats the only sign of life.

The noise was alarming and it seemed that the pipes were shuddering
with the force.

In January I changed the Fan and the Pump as both died within a day or
so of eachother. the system has been fine since then up untill now.

Any guidance appreciated.


IIRc the pump is external to this boiler but is/should be powered from the
boiler. Monitor the supply to and working of the pump if it happens again.

The noise sounds like a boiling boiler.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

In message .uk, Ed
Sirett writes
On Thu, 10 Mar 2005 17:50:22 +0000, Andy pandy wrote:


In January I changed the Fan and the Pump as both died within a day or
so of eachother. the system has been fine since then up untill now.

Any guidance appreciated.


IIRc the pump is external to this boiler but is/should be powered from the
boiler.

Controlled by a relay on the Pcb


Monitor the supply to and working of the pump if it happens again.

The noise sounds like a boiling boiler.



--
geoff

Since your rads are very hot I don't suspect the pump. I suspect the temperature sensor, change that first and report back.

On Sun, 13 Mar 2005 09:22:25 +0000, Paul Barker wrote:


Since your rads are very hot I don't suspect the pump. I suspect the
temperature sensor, change that first and report back.

I think you are right, reading the OP's descripition it does sound like
the OH cut out may have tripped. I think it's reset by turning off and on
on this model, IIRC, rather than a button.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

Thanks Guys

Well I turned the potentiometer down and more importantly found lots
of air in the upstairs radiators, and so bled them.

That was a few days ago and all seems ok for now.

Andy