Ursprünglicher Beitrag von: Daniel ,
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these low level sensors are usually triggered by a magnet in the tank. Try to figure out if it's a magnet or float that raises in the tank. I'd just get a magnet, remove the tank and run the magnet around the tank housing to see if the light goes off. I bet you'll find that there is an obvious spot on the tank for the magnetic float and that it's either stuck down or missing.
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