The pump seems to be malfunctioning in an unusual manner.
The pump seems to be malfunctioning in an unusual manner.
Hey guys,
I've been facing problems lately with unexpected shutdowns and no errors. After checking everything carefully, I realized the pump stopped working. It starts and stops quite consistently now that I'm monitoring it. It operates for about 65 seconds plus or minus a couple, then pauses around 7 seconds before restarting again. Occasionally it won't start up when it's on, sometimes needing the pump to be shaken or unplugged and then reattached.
This seems unusual mainly because of how steady its operation is. I expected a failing pump to be more erratic—running for hours and then stopping abruptly, or with varying run times. I placed an ear near it just before it shut down and it sounds like it's losing power rather than hitting an obstruction.
I took it apart (the warranty is gone) and checked the components on the board and pump housing. I ran through the housing with 2000 grit to look for small defects, just in case. The pump is an MCP35X, about four years old. I think I might need to replace it, but I'm planning to post a note in case anyone has seen or heard of this issue and has a solution.
CountMike shared his experience about the setup. He mentioned trying a direct 12v connection and noted that the system has always been connected via 12v without PWM control. He also confirmed that changing the rails didn’t resolve any issues, suggesting a possible problem on the PSU side.