On Nov 11, 7:09*pm, Graeme wrote:
In message , Michael
Chare writes

"Graeme" wrote in message
...

We have the above oil fired boiler, and the lockout keeps operating.
It *was serviced mid October, and the guy who did it cleaned
everything, and *replaced a jet, but could find no obvious fault.

I hope that the guy who serviced the boiler also tuned it by checking
the oil pressure, smoke and CO2 % and adjusting the air.

I'm not sure, to be honest. *He did have what looked to be equipment -
something with a long black tube. *Sorry to be vague - I haven't a clue
about boilers.



I have filters in my oil supply, if I don't change the elements every
few years they clog up and stop the boiler.

I don't think I have filters, in that there does not appear to be one at
the tank end outside, or the boiler end, inside.



Apart from making sure that you have some oil I don't think that there
is much more that you can do without a spanner.

To be honest, I'm looking for suggestions I can make to the engineer,
without looking as though I'm trying to teach Grandmother etc.

One thing I noticed is the odd sound the boiler makes, when it is
running. *There is the usual roar, but behind that is a sound more like
a vintage tractor. * Pah, pah, p, p, p, pah, pah, if that makes any
sense, which it probably doesn't.
--
Graeme

The new noise could be due to fuel starvation. Possible causes are
water contamination of the fuel or filters partially blocked. You do
not specify which model of burner is fitted but if it has a Danfoss
oil pump these have a fine mesh within the body of the pump as well as
the normally fitted tank outlet filter or secondary indoor filter.
Some bodged installs omit the primary filters.
Starting ok then dying would fit with a clogged filter. Other causes
might be the solenoid coil heating up and going open circuit while
hot, a photocell which is ageing and becoming unstable, or a problem
with the sequence control box. Intermittent faults are swines to cure
especially when they only occur at long intervals.