San T Flush

[kenbt]

My 2005 Vectra San T Flush system quit working. When I hook up a hose to it, no water is getting into the black tank. It is as if there is a blockage some where in the line. I attempted to blow out the line with an air hose, but same problem, the line is blocked. Does anyone know what could be the problem. I thought there may be a check valve in the line but I can't see it and if there was I was surprised the air pressure did not unstick it.

[tomsm]

There was a thread on this a few years ago. There is a check valve in there somewhere - I think maybe right at the tank, but can't remember for sure. Apparently, from the previous discussion, if you hit it with water pressure too fast it will block incoming flow. I've never had this problem so maybe some of them are more sensitive than others. Anyway, the point of the thread was that if you "sneak" the water pressure up slowly, the valve will flow fine. May be worth a try....

[Bob O]

There is a vacuum breaker under the kitchen sink for this line. It is located up high on the right side towards the back of cabinet on mine (05 Horizon 39AD). It is a brassn valve that is basically a one way check valve and the check may be stuck on it?
Hope this helps

[Billy S]

If it is not the check valve, the spray head may be plugged. I had that problem on another coach.

[GoRvin]

My San-T-Flush quit working, when I connect the hose the water flows out of a metal device that is under my kitchen sink. I believe this is to allow the water to go in and not allow any back flush.

Has any one else had this issue and where did you get this device?

Thanks
Ken

[NoMoreAZ]

There are two valves in series between the water inlet valve and the output at the tank. First is a plastic check valve, same color as the PEX pipe. Attached behind it is a vacuum breaker valve.

Location of the valves will vary by coach model and year.

If the vacuum breaker valve is allowing water out of it, get a new one from your favorite 'Bago dealer. If there is no water flowing to the tank, check valve is bad. This check valve has the same stupid mechanism as the brass check valves on the input and output of the hot water tank.

Be familiar with working with PEX to do the repairs. I have replaced my check valve.