Lazy Daze Owners' Group

In case this will be of any help, when we have had the bad sensor reading in our 2016 TK, I've fixed it using the Valterra Reverse Action Flush device - currently about $40 on Amazon Amazon.com: Valterra F02-4350 Reverse RV Flush Valve: Automotive

It's simple to use. You just put it on the dump pipe. The Valterra Flush thing has its own gate valve and a place you screw on a hose. Once you've emptied your black tank, you shut the gate valve on the Valterra, open the gate valve to your black tank and turn on the hose. The Valterra has a valve so no black water can get back into the hose.

The water from the hose will pretty quickly fill up the blank tank from the bottom to the top, so you want to keep checking the sensors and turn off the water in time not to have any disasters inside.

When the black tank is full, you open the Valterra gate valve and let all the black tank water out. You can repeat this fill-and-drain procedure however many times it takes to get the sensors to read correctly. It took us 3 tries once, but it did the trick. And since everything happens outside the LD the process is clean and easy.

I don't know if this will help for your situation but it might be worth a try,
Jim Langley
2016 24' TK

A Flush King is effective in breaking up debris only if it shoots directly into the holding tank.
Many LD holding tank's outlets have one or more turns, in the piping, that prevent a straight shot into the tank.
In this situation, in-tank flushers are a good addition to prevent build up.
Holding tank flusher | Flickr

Amazon.com: Valterra A70 No Fuss Flush with Accessory Kit: Automotive

Larry

Good point, Larry. The Flush King does not "shoot" water at anything as far as I can tell. What happens is it fills the tank up. Then, the "flushing" action happens when you empty the full tank. This has cleaned the sensors for us, but we are not full-timers -- yet. Thanks!
Jim