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What I'm not sure of (and maybe Steve is) is if the duovalve operation is similar to a mono water valve. If it is, you can get it in a failed state and find out if there is voltage to the control wires for the left side, you'd need to research which wires control this for the left or right.
If the scheme is the same as a mono valve, there should be NO voltage present, which represents valve ON, this would indicate a CONTROL problem, or if there IS voltage there, it represents valve CLOSED, which means the duovalve is the fault.
Gilly
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