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The Watts mixing valve in my radiant system is 1-1/2 years old (1 year warranty!) The plunger inside keeps geting stuck in the cold water position. I took it apart, checked everthing, and didn't find anything obvious wrong. Wax pellet is working fine. I suspect the large spring in the bottom has weakened and is not pushing the plunger up. This is running off of a domestic HWH set at about 120°F, so there is no way the valve is cooked.

Anybody run into this before?
Would a couple of shims on the spring fix this?
Should I get rid of this piece of junk and get a Taco mixing valve?

 

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Not real sure but the Taco looks the same, you may want to try a Sparco they are real nice and can take the abuse.
As to why this thing died? thermo shock?

Bernie
 
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