Well the problem is solved now, the cover on the sensor was allowing
water get onto the sensor from outside the tub. The tub has a vent to
the outside world just in front of the sensor and we had a strong wind
and rain strom the day before. All I did was remove the cover over the
flow sensor and found that some water was sitting on top of it. Dried
the top of the sensor off and replaced the cover turned on the power
and it works fine now.