Malfunctioning RV Holding Tank Sensor Probes and Potential Fixes

Here are three KIB Enterprise MP5 holding tank probes. On the left is what they look like delivered. The nuts need to be loose in order to press the other end into a 3/8" hole in the tank. In the center I've tightened the nuts a little bit and you can see how the rubber grommet is beginning to compress as it would once inside the tank and the inner nut tightened. After insertion and tightening the first nut, the electrical connector is placed over the threaded post and then the second nut holds it to the assembly. On the right you can see the probe is merely an assembly of five simple parts: a grommet, a stainless steel screw, a washer and two nuts.
Here are three KIB Enterprise MP5 holding tank probes. On the left is what they look like delivered. The nuts need to be loose in order to press the other end into a 3/8″ hole in the tank. In the center I’ve tightened the nuts a little bit and you can see how the rubber grommet is beginning to compress as it would once inside the tank and the inner nut tightened. After insertion and tightening the first nut, the electrical connector is placed over the threaded post and then the second nut holds it to the assembly. On the right you can see the probe is merely an assembly of five simple parts: a grommet, a stainless steel screw, a washer and two nuts.

I was recently faced with what may be the most ubiquitous problem in the world of RVing: a malfunctioning holding tank sensor system that incorrectly reports the fill level of the tanks. There are already a great many posts online about the subject with all kinds of suggested remedies. These include methods that attempt to clean the sensor probes by placing various solutions into the holding tanks, to rinsing wands that in some cases can be inserted into the tanks, to replacing the existing system with a new one of the same or different kind, etc. In my search for solutions I haven’t, however, come across information about locating replacement OEM sensor probes or installing them, and it took a bit of doing for me to locate some probes and information about installing them correctly. Sharing information on these latter two aspects of the problem is what motivated me to make this post. READ MORE…

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