Haven't had that happen, looks like you got a bad one. Guess call Brinsea and get a replacement, wouldn't try to do anything to it until you talk to them so you don't have a warranty problem.
What is the humidity set at? It will usually turn for a minute or two then stop if the humidity is too low in the incubator compared to the set, then start up again but it should keep trying even if it isn't getting any water through. Double check the connection maybe that it didn't pull loose?