Originally Posted by Kiril
When the zone is on, try adjusting the flow control if you can, and listen for changes in the flow through the valve. If you need to, do it on a functioning valve so you know what to listen for. Based on your results, that should point you in the right direction.
If you are on a meter, compare the gpm of each zone.
If on a well, time the drawdown time of the zones.
Wells are a little more difficult to measure, the pump has to be shut off and then the zone turned on and timed. There will be a click when the pressure switch cuts-in.
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