Amel Super Maramu 2000

Fresh water pump D plate pressure switch The Symptoms: my fresh water pump (light indicator on 24 Volt Panel) would go on for longer and longer periods. Used to be 20 seconds, became 40 seconds, sometime several minutes (so I would switch it off manually - on the 24 Volt panel). The Solutions: Help provided by Bill & Miles from the forum. I first switch off the fresh water pump (from the 24 Volt panel). Then depressurized the system by opening a tap. I took note of the 5 electric connections (2 from the bottom, 3 from the top) of top of the D-Plate Pressure Switch and disconnected them (see picture below) In my case: The bottom blue wire was going to the 2nd connection from the top The bottom black wire was going to the 3rd connection from the top The top blue wire was going to the 1st connection from the top The top black wire was going to the 3rd connection from the top The top brown wire was going to the 4th connection from the top Then I had to remove (unscrew) the water accumulator in order to remove (unscrew) the D-Plate Pressure Switch. I used a screw driver and vinegar to remove most the (I supposed) calcium (or debris). The little connection between that screw on the D-Plate Pressure Switch had a lot. I let it soak, etc. I put it back together (making sure to use teflon tape on the thread) and it works wonderfully!!! Overall job was easy, took 4 hours all together mostly on cleaning and also because of discovering/learning what to do, should take half that next time.   Note: I brought the D-Plate pressure switch and the little tube/connection that screw in to a store to buy some new ones, but the thread must be pipe metric... as none of the D-Plate Pressure Switch would fit into the connection that screw on. It is close to a 1/4" but is not. If anyone has part number for spares, that would be much appreciate.