On Thursday, 22 December 2011 21:07:35 UTC, 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?

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.

AJH

I see your problem was sorted by servicing the pump. great. If the blower starts but fails to ignite consider the fuel valve solenoid.(on top of the fuel pump). Mine caused an rcd trip . simple replacement with danfoss 071N0010.