You have to check the wiring. See the page from Ugley's Manual:
http://tinyisland.com/images/ugleys1.gif

Basically, the start button briefly energizes the coil, which generates a
magnetic field which closes the contacts so the motor runs. It also closes a
little relay bolted onto the side that's normally open. That relay has to be
wired from power to the coil, so if the relay's engaged and the power is on, the
contactor stays engaged. If the power goes off, then the coil is de-energized
and the contacts and the secondary relay open (by passive spring action) so when
the power comes back on it won't restart by itself. The Brits call this a
"no-volt release".

GWE