Struggling with inaccurate tank sensor readings in your RV? You’re not alone! Many RV owners experience false readings from their holding tank sensors, leading to confusion and frustration. In this article and video, we’ll explain how holding tank sensors work, why they sometimes fail, and how to properly clean and maintain them to ensure accurate readings every time.
How RV holding tank sensors work
Your RV’s holding tanks (fresh, gray, and black) have sensors that monitor the levels of liquid inside the tanks. These sensors are usually mounted on the sides of the tanks and detect when the liquid level reaches a certain height. The information is then sent to a gauge on your RV’s dashboard, giving you a reading on how full each tank is.
However, these sensors aren’t always perfect, and many factors can cause them to give false readings. Buildup inside the tanks, debris, or even moisture can interfere with the sensor’s ability to read accurately.
Common reasons for false tank sensor readings
Sludge and buildup
Over time, waste, soap scum, and other debris can accumulate on the sensors or the walls of the holding tanks. This sludge buildup can create false readings, making it appear as though the tanks are fuller or emptier than they are.
Corrosion or damage
Tank sensors can corrode or get damaged due to harsh chemicals or overuse, causing them to malfunction or give incorrect readings.
Improper tank treatment
Using the wrong chemicals or not cleaning your tanks regularly can lead to residue or scum that blocks the sensors.
Environmental factors
Temperature changes, exposure to moisture, and even dirt and grime on the outside of the tanks can affect the sensor’s performance.
How to clean and maintain your RV tank sensors
Empty the tanks
Before cleaning, make sure your holding tanks are empty. This will give you better access to the sensors and allow for more effective cleaning.
Use a holding tank cleaner
Invest in a holding tank cleaner that’s safe for RV systems. These cleaners are designed to break down waste, grime, and buildup inside the tanks. Some cleaners are specifically formulated to clean the sensors, as well.
Manually clean the sensors
If the buildup is severe, you may need to manually clean the sensors. You can do this by using a long, flexible brush to scrub the areas where the sensors are located. Be gentle to avoid damaging the sensors.
Use a sensor-specific cleaning product
There are products available that specifically target sensor cleaning. These are often added directly to the tank and are designed to dissolve the residue without damaging the sensors.
Flush the tanks
After cleaning, thoroughly flush your holding tanks with clean water to remove any residual cleaner or debris. This will help keep your system functioning properly and prevent future buildup.
Check for damage
While cleaning, inspect the sensors for signs of corrosion or damage. If the sensors appear damaged, you may need to replace them.
Tips for preventing future sensor issues
Use the right tank additives
Always use non-toxic and RV-safe tank chemicals that won’t harm the sensors. Avoid using harsh cleaners that can damage the sensors or corrode the tank.
Clean your tanks regularly
To prevent buildup, clean your holding tanks regularly. Depending on usage, you may want to clean them every 1–3 months.
Avoid overfilling
Overfilling your tanks can cause sludge to build up more quickly. Empty your tanks as soon as they reach about 75–80% full to prevent unnecessary buildup.
Check sensors periodically
Even if you don’t have false readings, periodically check the sensors to ensure they’re still functioning properly. Regular maintenance can help prevent issues from developing.
Install a tank sensor cleaning system
Some RV owners opt for a tank sensor cleaning system that automatically cleans the sensors while they’re using the RV. This can be a great way to ensure your sensors are always clean without needing to perform manual cleaning.
Properly maintaining your RV’s holding tank sensors is essential to avoid false readings and ensure accurate monitoring of your tanks. By following these simple cleaning tips and taking preventive steps, you can extend the life of your sensors and ensure your RV is always ready for your next adventure.
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More from Dustin
Make sure you check out my website, California RV Specialists, and our YouTube channel for more helpful information, and see our published articles on RVtravel.com and other social media pages.
