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[muffin]

I set my system up to work on a single pump and used 3-way zone valves to control the flow to my various exchangers.  I had an issue with my pool plumbing and had to rework some of hte pipes.  I noticed that the exchanger is very hot even though the 3-way valve is supposed to be off to it.  Do these leak a little?  The pex piping is fairly short, maybe about 6 feet on either side of the exchanger back to the main loop.  Could it just be conducting?  I am worried about this because the pool plumbing is just standard PVC and it threads into this exchanger.  One of the issues is that this adapter started leaking.  I was thinking it might be due to thermal change. 

When the pool pump is running it keeps it cool, but it only runs part of the day.

Thoughts?

I looked at my data.  I think the valve is malfunctioning.  Back in November, when the valve was off I would see the temperature on the Hx drop to almost ambient.  Sometime about mid November, I start seeing the off temp climbing.  Now it is pretty much stuck on it looks.  Any idea what fails on these and is it repairable?  It is only 1-2 years old.

[yoderheating]

I've seen the seals in the valves go out. Most likely not losing enough heat to worry about but when I want to be completely sure I put in a manual three way valve also. 

[muffin]

I've seen the seals in the valves go out. Most likely not losing enough heat to worry about but when I want to be completely sure I put in a manual three way valve also.

I have 3 of these valves in my system.  I believe one of the others is leaking too.  So 2 out of 3 are bad in about a year.  Is this normal?  These are not cheap.

[yoderheating]

I've heard that acidic water will eat the seals out but I have no idea if it is true.

[muffin]

I've heard that acidic water will eat the seals out but I have no idea if it is true.

I have not tested my water since I put it in a year ago.  I suppose I could test it again.