Welcome to Sunline Owners Club!
A few questions on your camper, is the camper new to you recently or have you had it a while and this is the first time this problem showed up but worked well many times before?
What brand, model camper, type of camper do you have? Trying to figure out if you have a large black tank or a small one. And a travel trailer or a fifth wheel as they have some very different piping between the toilet and the tank.
The usual reason for solid waste not draining is due to lack of enough water in the tank before and during use. More on this later after you get unclogged.
Now that your clogged, this may take a lot more to clear the tank. Do you have a tank cleaning wand? Like one of these, https://www.amazon.com/Valterra-A01-...lack+tank+wand
You hook them up to a water hose and while hooked to a dump site, flush trough the tank with a level of water pressure. Note: Recommend buying an all metal garden hose shut off valve the goes on the end of the hose before the wand. I will never again trust a plastic shutoff inside the camper....Had a very wet experience, "once"
If the waste is too built up, then yes it may need a snaking to break up the clumps that then the water wand can help break up and help flow out. Depending on a travel trailer of 5th wheel the how to do this may be different.
Hope this helps
Once you get clog free, we can help review your tank process to help this not happen again.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club