Sailing Pittwater to Sydney - but do we make it?

My first sailing trip from Pittwater to Sydney harbour, at least that was the plan. Any Yanmar heat alarm specialists here? The alarm went off when the Moro was under load, heading into a stiff westerly and against the tide. It was a constant beep. In the past, before I replace the impellers, the alarm was two tone beep beep. Curios to sort this overheating issue for good !