Most brands of 5er's use this POS toilet that people have complained about on many Brand forums for years,I went through 2 on Warranty on my 2012 Montana and my Buddy has his go out on his Grand Designs 5er as well,I finally gave up and bought a Dometic 310 and Problem solved and easy install when I bought my 2015 first thing I did is took the Thetford out and Threw it into the Dumpster and bought another Dometic this time a 320,I cannot believe Thetford does not recall this things or a least Redesign them,If the Mfg's would stop buying and putting these things in their Rv's Maybee they would wise up but they probably get them for real CHEAP
