Topic: Blank tank sending unit Open Fault Code OPn (Read 1681 times) previous topic - next topic

Has anyone had to troubleshoot an OPn code (Open Circuit) on their blank tank? I have a 2019 Unity Rear Twin Bed and I am not sure where the Blank Tank is? Which one and where are the wires from the sending unit in relation to vehicle landmarks underneath the coach?

Have a 2019 24MB and the tank is in front of the rear axle.  I had a broken wire to the sender and had to replace the sender.  Not a big issue if you want to do the work yourself.  I had to clean the undercoating off the old one and remove it then clean the area with mineral spirits.
Buy a new sender and cut to length and stick on.  ( go to RVupgrades.com for info) and wire it up.  Make sure the wire doesnt dangle so it can get pulled off again. I just used zip ties to secure it to something down there. 
Good luck.

Sorry, I replaced the fresh water sender not the black.  Once you find the black tank it should be the same.  I did a post earlier the forum that might have more information.

Good luck