We recently replaced the motherboard of an older Waters 2695 module (circa 2006) with a new ethernet board and installed firmware 3.03. The upgrade seems to work fine - the 2695 initializes without problems and communicates with an Empower 3 computer. However, the seal wash pump comes on (clicking noise) whenever the module is pumping mobile phase. The clicking stops when the pumping is stopped. This did not happen with the old motherboard.

My questions are:
(1) Is this normal for firmware 3?
(2) If so, how do you stop/disable it?

Many thanks for your help!