Originally posted by nickR
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When a group is activated but the control board does not receive a signal from the group's flowmeter within a certain period of time, it assumes a water flow problem and flashes all the touchpad lights. This will happen either if the flowmeter itself stops working so doesn't sense the water flow, or if there is no actual flow (as in your case) due to a blockage or a faulty 3 way valve on the group.
I'd probably start by swapping the 3 way valves between the groups and see if that changes things (which would indicate a blocked or faulty valve).
I wouldn't worry about the jumpers at this point - it's much more likely for a machine to play up due to blockages than to find someone has moved jumpers to the wrong positions.

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