Found the problem - installation mistake
We pull the tubing off that runs from the manifold pressure tap to the
WI pressure switch and it was full of water as so was the switch itself.
Turns out durring the install they use that piece of tubing to test the water pump and forgot the blow it out [ they will never make that mistake again ].
Tubing and switch have been dewatered and a filter inserted into the line to help prevent the problem isn the future.
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