Set Square wrote:
In an earlier contribution to this discussion,
a_mcbride wrote:

My ideal elan 2 boiler ignites from cold with no problem. However
after a period of time anything from an hour to longer it refuses to
fire up. After a period of time when it obviously cools down it will
then fire up again.

I initially thought there was a problem with the over heat stat,
although this does not need to be reset as it does not pop up.
However I replaced it with some success I thought as this morning the
boiler fired constantly. However the same problem has started tonight
again. I can hear the air pressure switch clicking in and the fan is
running but still no ignition. Was wondering if it could be a pump
problem, maybe the water can not get away from the boiler quick
enough and its overheating and then is cutting out until its cooled
down. However why doesn`t the overheat stat click in ?

Have phoned a round some heating engineers so far none want to know
this side of Xmas. Would a new pump solve the problem or is my
conclusion wrong? Don`t fancy being without consistent heat until
after Xmas.

Any help appreciated

Andrew

An


Very unlikely to be the pump - if that fails, the overheat stat
*will* trip and the boiler will then do nothing at all.

Agree with you here if the pump failed completely but the pump is at a guess 13 years old
its pumping but I wonder if its not pumping as efficiently as it once was and the flow
rate through the boiler has been dreuced therefore raising the temperatire within the
boiler.


Does your boiler have a row of (maybe 3) LEDs which come on in
sequence during the firing cycle? If so, how many of these are lit?

Only one light comes on when a demand for heat is required and this does light up.

The boiler is clearly *trying* to fire - otherwise the fan wouldn't
run. Depending on how far it's getting through the firing cycle you
could have a problem with the pressure switch, pilot solenoid,
ignition system or main gas valve. It's also possible - perhaps even
likely in view of the fact that it seems to be temperature dependent
- that you could have some iffy electronic components on the control
board.

Have put in a new pressure switch and I can hear that switching. The PCB is new as well so
doubt that is at fault.

Still baffled.

Andrew