When I turn on the power to my hot tub at the breaker, I can hear the relays closing and the pump hums for a short while, but it doesn't turn.
I recently drained and filled my hot tub. After refilling, I ran the pump for a few minutes to circulate some chemicals, so it was working at the time. I then turned off the power at the breaker to check something. Then, when I turned the power back on, the pump wouldn't start. The control panel lights up. I can hear the relays click in the control box, and hear a humming for a few seconds (the pump trying to start, maybe, it's hard to tell) then the humming stops.
I read that air in the pump can prevent priming. However, the pump did run for a few minutes after we refilled the hot tub, so I don't think it's air in the line. Just to be sure I loosened the outlet connector on the pump and water drained out, in hopes that any air would be released
The control box unit has two fuses labeled pump 1 and pump 2, and I've checked and they're both good.
The pump connects to the control box via a specialized plug, and I'm sure it's well connected.
- Maybe the capacitor on the pump went out? As I indicated, it's probably 10 years old. How do you troubleshoot that?
- Something jamming the pump from turning? How can you check that?
- Anything else?
Update 1 Replaced the capacitor and it ran for a short while but stopped again. I've removed the pump and will test it on a bench.
Update 2 After pulling the motor out I confirmed that the impeller could be easily turned by hand, so it wasn't jammed.