Spa pump motor won't run when its in the spa. I removed the pump and ran power to it and it runs fine. Also, with the pump removed, turned on spa jets and no problems. So, re-installed the pump and when turned on, I hear a buzzing sound for say 30 seconds and it trips the breaker. Any ideas please help, and thank you!
A few possibilities -
- The pump is frozen but the motor works - The motor cannot turn the pump. With the motor off of the pump, the pump is difficult to turn. - Fix the pump
- 3 phase motor driven with just 2 of the legs - something is disconnected somewhere - I've had this issues with a loose/melted wire nut on a motor with large pump that had this same issue. - Fix wiring
- The motor works without load, but is not able to work with load. Testing is tricky - try other possibilities first - problem could be motor, but more likely the driving circuits.