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Gray water status light indicates tank 2/3 full when it is empty

It started out with just the 1/3 light staying on but now the 2/3 light stays on yellow

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Trash, oils, grease on the sensor. Happens all the time. Just perform a good tank cleaning and that will be good.
Contact your local service center directly or online here:

Posted on Feb 06, 2018

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There are four sensors in the side of the tank. When they get blocked with scum they will give a false reading. Thetford makes a product called level gauge cleaner that you can pour into the gray water holding tank through the sink and tub/shower drains that will clean the sensors. There is also a product called Unique that is pretty good at cleaning. Try using one of these products, if that does not work then you may have to replace the sensors.

Posted on Jul 29, 2014

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