Flush Value Won't Let Water In

[sthrngary]

First hello everyone. I was ill for a year and did not post or reply. I am feeling much better and back to RVing. My question is this.

I have a 2018 Airstream Interstate Grand Tour. I was flushing my black tank and everything was good. Then all of a sudden on my second attempt, the water would not go in.

All I could figure was there was a value that closed to eliminate water from entering. Your assistance would be appreciated.

Gary

[Mcrid]

I've heard of instances where the check-valve not the black tank flush line being installed backwards at the factory.

[sthrngary]

Originally Posted by Mcrider

I've heard of instances where the check-valve not the black tank flush line being installed backwards at the factory.

It this case, it worked for many usages and just stopped during my last trip. Thank you for your response.

[Titus]

You are talking about flushing out the black tank using the hose fitting at the macerator hose reel, and not valve that flushes the toilet itself - correct? Agree it seems odd that a backwards check valve would work many time then stop working. Seems instead that the check valve may have been installed correctly then got stuck in the closed position after a long period of non-use. On mine the check valve is located about directly above the flush hose fitting - on the inside of the motorhome, near the outer wall and just below the counter top.

[toskeysam]

I did have my check valve stick shut once. It blew the hose off the fitting when I tried to flush.

[sthrngary]

Originally Posted by Titus

You are talking about flushing out the black tank using the hose fitting at the macerator hose reel, and not valve that flushes the toilet itself - correct? Agree it seems odd that a backwards check valve would work many time then stop working. Seems instead that the check valve may have been installed correctly then got stuck in the closed position after a long period of non-use. On mine the check valve is located about directly above the flush hose fitting - on the inside of the motorhome, near the outer wall and just below the counter top.

Titus, first I hope you are doing well. Thank you for your response. Yes, the flush value on the exterior that is on the same panel as the macerator.

Using your verbal diagram, the macerator panel which included the flush intake is on the bathroom side not the counter top. Thoughts on getting to it to see if it is stuck.

Thank you for reaching out.

[rowiebowie]

My model is not an Interstate, but my tank flush check valve sits high and directly above the San-T-Flush. In my case, behind the fridge (I have the small 3.1cf Novacool). I can access it by removing the four screws that hold in the microwave that sits directly above the fridge.

Glad to hear you are feeling better.
.

[Titus]

Our Interstate must be different from yours. The bathroom on ours is on the curb side. From the fitting by the macerator the pipe goes up along the inside wall and the check valve is just below the counter. Then after the check valve the pipe goes back down and passes under the floor over to the black tank, which is beneath the toilet. The check valve has to be at a point higher than the black tank. Hopefully the check valve is not between the shower stall and the wall of the van. Our interstate has an access port below the bathroom sink - perhaps you would find the check valve in that area. We also have an access panel in the wall at the rear of the bathroom. Good luck in your search.

[sthrngary]

Thank you again for responding. I called Airstream and they had me call the local dealer. Now the real issues happen. The consensus is it is a faulty valve. Telephone tag time with the Dealers Service Department.

I feel lucky the only real issue I have had in over a year is this valve. A credit to Airstream Interstates. Thanks again.

Originally Posted by Titus

Our Interstate must be different from yours. The bathroom on ours is on the curb side. From the fitting by the macerator the pipe goes up along the inside wall and the check valve is just below the counter. Then after the check valve the pipe goes back down and passes under the floor over to the black tank, which is beneath the toilet. The check valve has to be at a point higher than the black tank. Hopefully the check valve is not between the shower stall and the wall of the van. Our interstate has an access port below the bathroom sink - perhaps you would find the check valve in that area. We also have an access panel in the wall at the rear of the bathroom. Good luck in your search.

[sthrngary]

Thank you for your feedback. The valve for this issue should be right behind the macerator panel on the drivers side exterior. Really small space. I will play with the solution for a while. Airstream just wants me to go to a dealer which is always my last resort. Thank you again for your assistance.

Originally Posted by Titus

Our Interstate must be different from yours. The bathroom on ours is on the curb side. From the fitting by the macerator the pipe goes up along the inside wall and the check valve is just below the counter. Then after the check valve the pipe goes back down and passes under the floor over to the black tank, which is beneath the toilet. The check valve has to be at a point higher than the black tank. Hopefully the check valve is not between the shower stall and the wall of the van. Our interstate has an access port below the bathroom sink - perhaps you would find the check valve in that area. We also have an access panel in the wall at the rear of the bathroom. Good luck in your search.

Originally Posted by rowiebowie

My model is not an Interstate, but my tank flush check valve sits high and directly above the San-T-Flush. In my case, behind the fridge (I have the small 3.1cf Novacool). I can access it by removing the four screws that hold in the microwave that sits directly above the fridge.

Glad to hear you are feeling better.
.

[toskeysam]

I mentioned earlier that my valve stuck on my 2013 AI Lounge Ext.....what I failed to mention is that when the flow finally broke loose through the valve, it had exploded. I sprayed the back of the microwave before I realized what had happened.
I subsequently removed the microwave, let it air dry for a couple of weeks, replaced the valve and reinstalled the now dried out microwave. All has been well since that episode....three years ago.

[GETRIDAONE]

The valve on mine had been installed backwards (picture). I had to remove the freezer to gain access to the valve. It has been several years but I think the door on the freezer had to be removed and this still only allowed about 1 inch of clearance in the aisle to move it out of the way.
The check valve is the gray colored one under the mounting strap. The bronze valve is a vacuum breaker.