"I have a combo heat light - exhaust fan in my master bathroom that
when you
turn on the switch for the heat light it will not come on untill you
turn on
the switch for the exhaust fan and same thing happens when you turn on
the
exhaust fan, the fan will not come on till you turn on the switch for
the
heat light. "


The one way I can think of that this would happen is if the switchs are
wired in series.