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Old 08-21-2016, 10:10 AM   #1
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Sensor for holding tanks??

I'm new to site. I apologize if this is not where to post this but we purchased a cottage in Jan of this year had it delivered to our lot in May. We have had a few issues already which is disappointing but this last one not sure what to do. It shows all of our holding tanks full even after they have been emptied. Anyone know what the issue is??
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Old 08-21-2016, 10:20 AM   #2
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Your sensors in the tank are dirty. These sensors in RV's seem to always do this. This is caused by a bit of dirt or crud on the button sensor in the tank. You can attempt to clean the probes but the problem will come right back. You can either paint over the lights and not pay any attention to them or replace them with a system that is out side the tank or replace the probes with Horst probes in the tank. Most of us just ignore the tank status lights.
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Old 08-21-2016, 10:28 AM   #3
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Welcome to the forum its the place to get your questions answered, there are many threads that talk about tank level indicators and how to fix the problems. Most times the wrong indications are caused by a film build up on the tank walls allowing electrical current to flow between probes. they do make a level indicator that this doesn't happen to do a google search for RV tank indicators. good luck
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Old 08-22-2016, 08:43 AM   #4
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Quote:
Originally Posted by Peterkm5 View Post
I'm new to site. I apologize if this is not where to post this but we purchased a cottage in Jan of this year had it delivered to our lot in May. We have had a few issues already which is disappointing but this last one not sure what to do. It shows all of our holding tanks full even after they have been emptied. Anyone know what the issue is??
Well, you could ignore one of the more important systems on the coach, or repair the problem so it never happens again. The problem is the design of the MicroTrend tank indicator sensor. It is basically a threaded bolt with a rounded head that goes into the tank in 4 places. While it "won't catch toilet paper" as some think, it will short out to the wall due to the tiny insulator ring between the bolt head and the wall itself (which conducts electricity due to slime on the wall).

This thread is how I solved my tank indicator problem.
Horst tank Probe Installation

Horst Mircacle Probes - Get accurate reading on your RV's holding tanks

Here is WHY your probes don't work and here is why the Horst probes DO.

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Old 08-22-2016, 08:48 AM   #5
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Additionally, in a seasonal, ALWAYS keep your black tank valve closed until it is full. Never keep the black tank open as it will fill with solids and you will have a VERY expensive repair (if you can even find someone to actually replace your tank).

Use LOTS of water with each flush and dump only when full.
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Old 08-22-2016, 02:14 PM   #6
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Cottage

I leave the grey tanks open and dump black every week to 10 days you can tell when it is getting full by a different sound when dumping
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Old 08-22-2016, 02:41 PM   #7
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I leave the grey tanks open and dump black every week to 10 days you can tell when it is getting full by a different sound when dumping
I was sure you knew that, but you can't be too careful when you are talking about the black tank.
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Old 08-22-2016, 07:03 PM   #8
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Same problem everyone of us has.
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Old 08-22-2016, 07:10 PM   #9
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You can try calgon and ridx, if soaked long enough it will help dissolve the film build up.
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Old 08-24-2016, 10:19 AM   #10
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I am reading this thread and wondering why Forest River would continue to sell RVs with sensors in their holding tanks that don't work from Day 1, especially when there are apparently good sensors made by Horst that I would have paid extra for at the time of sale... if only I had known. If anyone from FR is curating this thread, I would appreciate the courtesy of a reply. Thanks.
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