check valve or dom hw heater fail?

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Fritz57

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about a decade ago we redid the kitchen and added a Taco mix valve to fill turtle tanks (yes, plural, don't ask).
Since it was a mix valve I figured a check valve would be a good idea.

In the last 6 years, or so, we had the heating plant taken from 1 to 3 zones, and a new separate dom HW heater, 45 gal.

Recently, when we turn water on in one part of the house, the hot goes away from another area, kitchen sink or a bath.
I've started to notice the kitchen sink vacillates back and forth, hot and cold, when only hot is on.
And other issues like this when only one faucet is on.

I wonder if this is a dom hw heater issue or perhaps the check valve has failed?
..
 
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it is a Watts LF600 check. It's about 10 yo.

I also noticed there is some rust at the circ pump of 1 of the zones. Issue or not?

https://flic.kr/s/aHsm5XVDjT

last photo, left most zone/pump.
 
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