I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

"obclare" wrote in message
m...
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Contact Ariston and see what they say.

In message , obclare
writes
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas?

Hard water area?

Is the heat exchanger scaled up?

Is there a blockage in the system

Is the pump working properly ?

I'm afraid, to properly diagnose this, more info is needed

is it fully firing up or just starting - still sparking?

Has this suddenly happened or has it been getting progressively worse?





Various bits have been
replaced but to no avail. Very occasionally the system works.

--
geoff

"IMM" wrote in message
...

"obclare" wrote in message
m...
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Contact Ariston and see what they say.

I'd second that, their tech people have been very helpful to me.
They will probably recommend someone who has actually been trained on the
boiler :-)

raden wrote in message ...
In message , obclare
writes
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas?

Hard water area?

Is the heat exchanger scaled up?

Is there a blockage in the system

Is the pump working properly ?

I'm afraid, to properly diagnose this, more info is needed

is it fully firing up or just starting - still sparking?

Has this suddenly happened or has it been getting progressively worse?

Thanks for the reply.

It is a soft water area. Very unlikely the heat exchanger is scaled
up, as it is only 2-3 years old.

No blockage in the system since it has been known to work.

Pump seems ok, when the system works.

It seems to be more or less constant now, from an intermittent fault.
Apparently the gas engineer is now going to replace the heat
exchanger. Its a friend of mine, but it seems to be a case of just
trying things. I'm not a gas engineer, but I wondered if the
thermostat that tells the temperature of the heat exchanger could have
gone, so it thinks its hot and cuts off, but then there would have to
be another thermostat that tells it to fire up again. It does fully
fire up, as far as I can see. I don't know whether the spark stops.

I'm getting near to the stage to say get a brand new unit.



Various bits have been
replaced but to no avail. Very occasionally the system works.

"BillV" wrote in message
...

"IMM" wrote in message
...

"obclare" wrote in message
m...
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Contact Ariston and see what they say.

I'd second that, their tech people have been very helpful to me.
They will probably recommend someone who has actually been trained on the
boiler :-)

They tend to know all the scenarios that have arisen and can pinpoint the
problem much quicker.

"obclare" wrote in message
m...
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

==================
If this was a carburettor in a car I would say that there was a bit of loose
grit periodically blocking the main jet. Your problem might be similar - a
bit of loose grit or scale might be blocking the the main jet / injector.
Have you tried removing and cleaning the main injector / burner?

Cic.

In message , obclare
writes
raden wrote in message
...
In message , obclare
writes
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas?


....

, but I wondered if the
thermostat that tells the temperature of the heat exchanger could have
gone, so it thinks its hot and cuts off
,
That was going to be my next question after eliminating the obvious
ones. IF the temp sensor has gone off, then it could be still working in
a borderline fashion, but then you'd need to be able to measure the
resistance (IIRC about 10k at 20 degrees, about 3k when it's up to
temperature

but then there would have to
be another thermostat that tells it to fire up again. It does fully
fire up, as far as I can see. I don't know whether the spark stops.

Well, you know the little click, click, click, woom (so to speak) you
hear as the boiler ignites, well if it keeps on going click, click,
click ... click, click then it's not sensing the pilot being alight and
will stop and try again (I think ... I can't remember on the Ariston
exactly)


I'm getting near to the stage to say get a brand new unit.



Various bits have been
replaced but to no avail. Very occasionally the system works.

--
geoff

In message , obclare
writes
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Is the high gas coming on blowing the flame out?

Is the high gas coming on blowing the flame away from the flame sense
electrode?

Dicky relay on the control board ?

You don't say what bits have been replaced

--
geoff

What do Ariston say?
It should be/must be, a known problem.

Hugh

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"raden" wrote in message
...
In message , obclare
writes
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Is the high gas coming on blowing the flame out?

Is the high gas coming on blowing the flame away from the flame sense
electrode?

Dicky relay on the control board ?

You don't say what bits have been replaced

--
geoff