04-16-2019, 06:08 AM
Reese When we get ready to go on a trip and the coach has been just sitting for some time, I like to get rid of whatever water is in the fresh water tank; then fill with NEW water. Here's what I do. I turn OFF the water pump and do NOT ever turn it back on until the tank is filled and you're ready to use it. Doing that prevents getting any more air than necessary in the water lines. I then open the valve that drains the FWT. I connect the fill hose to a nearby hydrant at our house that luckily is part of the soft water system. Once FWT is drained, I open the hydrant valve, turn on the city water switch in the galley, then press PUMP which enables auto fill. On my coach #800, that is the ONLY way to turn on auto fill. It does NOT come on automatically, regardless of how much water is in the tank. After the water has run for a few minutes, you'll see more water come out of the FWT drain which is still open. Now go close that drain, and let you tank fill. You can shut off autofill by pressing PUMP or it should shut off automatically when tank reaches 95%. After you've filled the tank, turn on the water pump and run water everywhere in the coach to get any air out of the lines. When you turn off the water, you should hear the pump run for a bit and then stop. If it stays stopped, you're good to go. If it cycles on and off, you probably still have air in the lines and need to continue to run more water until resolved.
Now for your auto fill problem. I once did the procedure above, but when I tried running water, it just wouldn't build up pressure and the pump would not shut off even with water turned off.. I called the Newell hot line and talked to a tech. He correctly suspected that the auto fill valve was stuck in the open position. He helped me locate the valve in the plumbing bay and then told me how to remove the bottom part of it. Four 7/16s screws and it came right off. NOTE: IT IS ULTRA IMPORTANT TO REMEMBER EXACTLY HOW THIS WAS POSITIONED WHEN YOU TAKE IT OFF, IT HAS TO BE PLACED BACK IN THE SAME POSITION. I PUT A PAPER CLIP THRU THE FRONT RIGHT HOLE SO I'D REMEMBER. Once off, there is a rubber diaphram in it. If you look real close, there is a little hole in the diaphram that is about the size of the tip of a ball point pin. What happens it that mineral deposits in the water can get lodged in that hole (like if the coach was sitting for a long time). And if they do, the valve doesn't operate. In my case, sure enough, that hole was blocked. I used something sharp and cleaned the deposit out of the little hole, cleaned any other nasty stuff off of the diaphram, then remembering how it had come off, re-installed. The diaphram has a hole in each corner where the mounting screws go. I got two on opposite corners started but not tightened so the rubber would still move. I got the others started also, then tightened the whole thing up. That fixed the problem. Hope this helps
Now for your auto fill problem. I once did the procedure above, but when I tried running water, it just wouldn't build up pressure and the pump would not shut off even with water turned off.. I called the Newell hot line and talked to a tech. He correctly suspected that the auto fill valve was stuck in the open position. He helped me locate the valve in the plumbing bay and then told me how to remove the bottom part of it. Four 7/16s screws and it came right off. NOTE: IT IS ULTRA IMPORTANT TO REMEMBER EXACTLY HOW THIS WAS POSITIONED WHEN YOU TAKE IT OFF, IT HAS TO BE PLACED BACK IN THE SAME POSITION. I PUT A PAPER CLIP THRU THE FRONT RIGHT HOLE SO I'D REMEMBER. Once off, there is a rubber diaphram in it. If you look real close, there is a little hole in the diaphram that is about the size of the tip of a ball point pin. What happens it that mineral deposits in the water can get lodged in that hole (like if the coach was sitting for a long time). And if they do, the valve doesn't operate. In my case, sure enough, that hole was blocked. I used something sharp and cleaned the deposit out of the little hole, cleaned any other nasty stuff off of the diaphram, then remembering how it had come off, re-installed. The diaphram has a hole in each corner where the mounting screws go. I got two on opposite corners started but not tightened so the rubber would still move. I got the others started also, then tightened the whole thing up. That fixed the problem. Hope this helps