Hi

We've moved into a house with a Glowworm Spacesaver 80B Mk 2 boiler which
has two problems. Firstly, it's noisy, banging away like nobody's business,
which I guess is kettling so I can hopefully fix that with various chemicals
and a good flush. But of more immediate concern is that is sometimes trips
the main RCD for the house, not an individual circuit breaker, but the one
for the whole house, so I guess this is due to earth leakage. I don't think
it's the CH/HW pumps (1 of each - strange setup), and when switching off
sometimes I think the gas valves makes lots of rapid switching noises. Or
could it be the timer? It seems to do it at no particular time, so not due
to timer trying to switch on/off boiler for example.

The boiler seems to be fairly simple electrically with a transformer, a
thermostat, a gas valve and very little else!

Any ideas? Or is it best to bin it and get a new boiler which I really don't
want to do at this stage, though it's over 20 years old now.

Thanks

Jonathan