Ron3rd wrote:
If someone's sticking a toilet brush down past the valve, it's easy to dislodge the seal, the wife does it all the time on our 310 and the fix is easy. There is a procedure from Thetford that calls for re-seating the seal and filling the boil with nearly boiling water and let it sit for a while. Maybe somebody can post this procedure as I can't get to it right now. Works every time.
Does Dometic Have the Thetford line. It was my understanding that the Thetford line was part of NORCOLD. If so the Hot water fix might not be the thing to do on a DOMETIC product.