Septic tank light confusion

[Rowlander]

I just had the tank pumped, but now both the red "full" and green "empty" indicator lights are on at the same time. I am not sure what's going on, it seems like a wiring issue or sensor problem. I really want to know what could cause both lights to activate simultaneously?

 

[rb.gg1ns]

The most common cause would be a sensor issue, especially if what you have is the old-school probe style!
Even after a fresh pump-out, a thin layer of residue can build up on the probes over time.
This gunk can create a small electrical path between the full and empty sensors, confusing the monitor panel into thinking both lights should be on.
Try giving the tank a good flush by running a hose down the deck fitting and blast it with fresh water for a while.
I'd also use a bit of Dawn dish soap to help break up any gunk.
I hope that fixes it or you might need to pull the sensors and clean them by hand.

 

[Mirrors]

If both lights are on, it's likely a faulty float switch, crossed wires, or a short in the sensor circuit, check the wiring for corrosion and test each sensor individually to pinpoint the fault.

 

[Rowlander]

The most common cause would be a sensor issue, especially if what you have is the old-school probe style!
Even after a fresh pump-out, a thin layer of residue can build up on the probes over time.
This gunk can create a small electrical path between the full and empty sensors, confusing the monitor panel into thinking both lights should be on.
Try giving the tank a good flush by running a hose down the deck fitting and blast it with fresh water for a while.
I'd also use a bit of Dawn dish soap to help break up any gunk.
I hope that fixes it or you might need to pull the sensors and clean them by hand.

I didn't think about residue bridging the probes. I'll give the fresh water and Dawn flush a shot before tearing into anything, I hope it's just buildup and not a wiring mess

 

[Rowlander]

If both lights are on, it's likely a faulty float switch, crossed wires, or a short in the sensor circuit, check the wiring for corrosion and test each sensor individually to pinpoint the fault.

Gotcha, l'll test each sensor one by one and see if corrosion's the culprit