Those usually 3-legged black blocks containing 2 PTC disc thermistors.
One of a few tens of ohms (cold) feeding to the coil and one of a few
hundred ohms (cold) connected between live and neutral , what is the
function of the one across the mains ?
As that one is separated from the other by 2 sets of spring clips, it cannot
be there for indirectly heating the one feeding the coil for quick
completion.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/