Thetford C224CW pump replacement

I would have thought those three sticking out lugs (probably a fourth on the back) might engage into slots / grooves and some rotation will be required for removal. Perhaps worth a try before trying to wedge it out.

I think you are right, we have a similar manual pump sprayer and the handle has to be locked in place before it can be unscrewed, well a small twist. I know it's not the same but the principle might. 

Thanks so much for all of your advice. Cornersteady and SteveL, you were quite right. We ordered one from Leisureshopdirect and also emailed them for advice. We received this response:

To remove the pump , it will need to be pulled up as if to flush then turned anticlockwise and it should unscrew and just lift out .

Hope this helps anyone else if they search for a solution to this in the future. We will let you know how we get on when it arrives.

Update - we fixed it.

First we cleaned the tank with Puriclean as advised on the Thetford website in case there was scale preventing it was from working (and it looked like there was some black gunk in there from the filler outside). Then we emptied the tank fully.

Then we went inside and followed instructions given for removal. It was so simple, pulled up flush handle then turned flush handle gently but firmly about 1/4 turn anticlockwise. This unlocked it and we could pull it out.

All that was wrong was that the plunger bit and come out of the pump, probably from over vigorous pumping by us. We managed to push the plunger bit back in by lining it up and clicking it into place, it was quite stiff and needed one of us to hold it and one to push. Then we put the flush/pump back in, making sure it was lined up so we could turn the flush handle clockwise 1/4 turn so it finished in the right place.

Really hope this can help others with the same issues.

The replacement we ordered for supposed next day delivery was delayed so we have cancelled the order. We are so glad we researched this ourselves and now know how it all comes apart and we can fix or replace it if there are future issues. It certainly was not a job we would have needed to pay anyone to do and we would much rather fix minor issues ourselves if we can.

Thankfully Three Shires Leisure are now doing our servicing and did a brilliant job of a warranty repair on our water tank, resealing it and adding a drain tap like motorhomes have, which is working really well for us. They also added a switch for the taps so we can open them and disconnect them from battery for storage. So we will rely on them for anything we can't do ourselves.

Well done!

Incidentally, using pink flushing fluid can be a cause of black gunge.

Thanks. We have actually been using Elsan green with a bit in the flush tank. We read the same and having cleaned the tank have decided to just use water now. We'll also give the tank a clean with puriclean when we store it like we do with our fresh water tank.