andrew wrote:
> I've just had a call from an old colleague, his central heating is tripping
> its circuit soon after starting.
>
> It's a 10 year old rayburn range and a pump. My guess it's something in the
> oil burner ignition circuit but what chances a circulation pump would fail
> with an earth leak?
>
very high.
> Any other suggestions as to what to check, he's some 50 miles away so not
> easy to advise from a distance.
>
> The local rayburn/aga agents charge loads of dosh and tend only to replace
> whole assemblies.
>
id say almost certainl some pump or other.
I had a motor on the washing machine do this: stripped it down to bare
parts and all I could tell was somewhere in the armature was a 3k short
to the armature metal. No reason, no other symptoms. Just did it.
Find out where in the cyckle it does it..
on my system thermostat moves motorised valve - takes a second - then
valve starts pump - then delay another second, boiler fan fires up - two
seconds more then ignition cuts in. few more seconds and boiler should
go WUMPH
work out how far it gets.
Id hazard a bust motor in the valve, the pump or the boiler fan as
equally probably to the igniter.
isolating the lot and pissing with a resistance meter is a way to go.
> AJH