Did you ever resolve this issue? Mine did the same and yesterday the vacuum pump stopped working all together. The pump PCB has some water damage but has worked with this water damage for more than a year. Pressing the RC button does not start the vacuum pump at all. Is there a way of testing the unit before replacing seeing as it is incredibly expensive? There is 4 pin connector on the vacuum pump unit that is not connected to anything, does anybody know what this is?