The sensor was probably disconnected for the same problem as you are being pestered with! The sensor works by detecting the level of a float within the tank. The float can be affected by a jelly like gunk that collects at the bottom of the tank. Easiest way to clean the tank is remove the pump and filter, clean the filter with warm soapy water. Place a basin under the tank, make up a bucket (or watering can) full of mild bleach solution in warm water. Pour it through the tank into the basin, repeat that a couple of times then thoroughly flush the tank with clean water. Replace the filter and pump, refill the tank.
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