In June my Thetford toilet decided to stop flushing. So I have now replaced it. It is a relatively easy job to do. I have some photos below as a guide, but there are plenty of videos on You Tube for the same job.
When you press the flush button, nothing happens, so follow these steps.
1. You need to check that you have power to the switch on the loo, I did as the 12v lighting dimmed when I operated the button. However, you have 2 fuses, one is inside the van on you fuse board, the over is hidden by the waste tank in the side compartment.
The fuse in the toilet compartment. If t you have power to this point and the fuse is ok, it is either a seized pump or a faulty switch.
You need to prise the button cover off gently with a flat blade screwdriver, and remove sealant. There are 4 x head screws to remove then you can unclip and remove the pump. The impellor on mine had seized up. When you cut the wires be careful to leave plenty of cable to reconnect the new pump.
The new pump has male and female crimped connector with a shrink wrap sleeve to keep the joints water tight. Re- fitting is the reverse of the removal, but make sure you put the feed pipes back on the flush port the right way around, or else you will get blow back.
Sorry there is a lack of photo's but the water tank, parts and cables get awfully greasy with is residue from using the pink flush liquid.
If you have any problems please message me. I am only too happy to offer advise.