Hi Judi,
If you're hearing fans, I'm assuming they are the fans inside the bus. Can you walk around to the rear of the bus (usually the location of the Webasto) and with the engine off and the switch on for the Webasto see if you can hear anything.
Typically the Webasto will try to start, (if it has electricity) but if it doesn't see any flame in the burner it will shut down to prevent over saturating the burner with fuel. It would be nice to know if at least it was trying to start in that 2 minute period.
I'm not familiar with Vancouver, but if you have a sizeable Marina around you, they are used to working on the Webasto (or AquaHot - which is basically the same thing.)
Mike