House Biotch

Our 1999 hot tub has started leaking into the blower motor air line and of course this trips the circuit breaker.This only occurs when the water level is at the max water level line and 1 or more people get into the hot tub. If the water level is lower and people get in, it doesn`t leak back into the blower line unless the water level is exceded. This did not use to do this. Can anyone out there help?????