> Curt Raymond wrote:

> You could wire a light to the monovalve and watch for it's
> activity. Power out I think means monovalve open which means
> heat on.


> Even if I've got the state backwards (light on versus out) if
> the monovalve is always powered to a constant state while
> having alternating hot and cold it should point to a bad
> monovalve.

Nope.  The monovalve modulates the heat by turning on and off.
Although, if it's  in cool-the-cabin mode, maybe it should stay
water-off - which is power-on.

--   Philip

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