In message , "Dave Plowman (News)"
writes
In article .com,
wrote:
I've got an old Chaffoteaux et Maury boiler that has stoped working (
Challenger 50 ff).

When the boiler fires up the circuit in the boiler is supposed to send
240v to the pump but it doesn't.
Done some checks on the pcb and the circuit that controls the pump is
not working.

I'd suspect a faulty relay on a device this old.

Nope, it's run by a triac

--
geoff