Originally Posted by willyg113
I think if replacing the valve doesn't work II will look into the backflow preventer valve on the heater.thanks
Was thinking about the check valve on the heater and I can't see how it could be "your" issue. If the valve is doing its job when properly positioned, no cold water should be bypassing it. The check valve at the top has to do with winterizing and keeping the antifreeze out of the HW tank when the valve is positioned to bypass the heater.
I think the valve (or the handle) has been misaligned inside the valve body. I think it is 90 degrees "out of phase." There should be a shaft with 3 holes in it. (picture a T on its side --| like this) When the holes are aligned --| the valve is in bypass (your handle is supposed to be toward the bypass hose). Then rotate the valve counter clockwise and the valve body should look like and the lever should point at the cold pipe:
cold __ hot
side | side
Best I can do within the limits of the forum's posting software.
The hole pointing down will be blocked by the side of the valve wall and the water will flow straight through.
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