I have an entirely different kind of shower sump
Blue Moon—a 2013 Oceanis
48—has a shower
sump in the master cabin
which is equipped with both a float switch and a manual button. As in the aft head/shower (which has no float switch) the manual button runs the sump for 15 seconds each time you push it.
The first time the master shower
sump quit working, it was repaired under warranty. We do not know what was actually done. Now, six months later, it has failed again. Our attempts to tease out the origin of the problem reveal that it has failed in a rather odd way.
If you shut down power to that shower sump circuit by popping the breaker, as soon as power is reapplied, the sump runs for 13-15 seconds—then quits. The only way to get it to run again is to interrupt and reapply power to that circuit. We also did this by interrupting the entire 12V Domestic power circuit and then reestablishing it. Same result.
These tests were all done with water in the shower pan so the presumption is that it was the float switch that was making the pump run. The manual button was never pushed as a part of the testing other than after the pump stopped at which time it had no effect. Interestingly, the pump timing relay is programmed to apply power for 15 seconds in response to a button push. The float switch (when working correctly) will allow the pump to run continuously as long as water is present.
Anybody have any ideas?