Okay, I just received two defective DDC-2's from customers... both are having intermittent starting problems and are abnormally loud. Interestingly, however, they seem to be suffering from different problems.
The first one, sent in by smopoim86, has a severely warped impeller (sorry, no pics), causing the impeller to grind against the ceiling of the impeller housing. Sometimes, depending on where the impeller stopped previously and how much voltage you're giving the pump at startup, the pump fails to start. Other times, the pump starts but makes an incredible racket (clacking, buzzing, vibrating, etc.).
The second pump, sent in by a different customer, almost always fails to start. Upon inspection, I found that the impeller was fine but there was some scorching and contact discoloration on the pump's PCB (below). Additionally, the few times I did manage to get this pump to start, it wasn't performing as it should (its head pressure was maxing out at about 6psig, instead of the usual 8.5pisg).
Having found this, I decided to inspect a little further and fond the following:
If I have time next week, I'll take a closer look at it and see if I can come up with some useful information for your guys.
Reply With Quote
Bookmarks