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The check valve goes on the hot water side. And it can be put in backwards. Check that. The spring side goes towards the tank.
Was this a check valve or a bypass valve for winterizing? No airlock really possible. You can install those bypass valves backwards as well. Check that and see.
The check vavle goes on the hot water side. Brass or plastic? They have no knob on them. If this is backwards to won't work.
The blue line is cold water and goes on the bottom of the tank. Hot water is a red line and comes out the top of the tank.
I have been at this business for over 15 years and never seen one on the cold water side. No reason to have one there. In any event, it is keeping the water from going into the water heater OR you have something on the hot line keeping it from coming out. This should be easy to figure out here. What is on the hot side? And is there a bypass for winterizing or not? Attach a photo of this whole area to your post and so I can see what the plumbing looks like.
You can go to Winebago Plumbing diagrams online and get them.
get me the model number and I can look for them here.
Let me get to my computer and take a look at them. Give me a bit.
See the attached diagrams. They don't show the back of the water heater. Can you attach a photo of that to your post? Use the paperclip icon. http://www.winnebagoind.com/diagram/2004/04_p36g_plumb.pdf
If the tank fills then there is no reason it shouldn't exit out the hot water on top unless that is plugged up or has a bad check valve. The only reason for having check valves at all is to winterize these and keep from having to fill the water heater with antifreeze. So, yes......you can remove that and the system would work fine, so long as the other parts are functioning properly.
I doubt that will work. Better to try to unplug it from the rear.
Just checking back in to see if you were able to get this resolved?
Any chance you got on on backwards? If not, one may be broken. They have a directional arrow on them.
"one on" there..........
Any chance you got that on backwards? The spring side goes towards the water heater.
There may be debris blocking that hot water line inside. Not that large a diameter.
Just checking back in to see if you were able to get this resolved and working again?