Original > Hot Tub Forum
GFI Tripping
Botswana:
Yes, it is the low speed of the primary pump that is trying to come on. It may do some testing of the temp, but that wouldn't involved the heater, at least not immediately. The fact that is happening right when the pump tried to turn on either to do a filter or heating session makes me think its not a heater or related sensor (flow or temperature sensor). Just cant figure out what else it could be. New pump which has a newer capacitor. Wires seem okay (i dont think they were replaced with the pump, i think he just replaced the pump and they are wrapped together except at the ends)
bud16415:
Sure sounds like one of those places. For it to trip the GFCI it has to be leaking the threshold current level to ground someplace. I think it is 5ma. A wire barely grounding to something metal or the ground wire seeing a crack in the hot wire insulation etc. Same with the motor, a winding going to ground once in a while. Intermittent minor grounds like this are often moisture related.
Once again the megger is the tool to find this.
Botswana:
Okay I'm gonna ask neighbor if I cam borrow it. Can you detail, as specifically as possible, what testing I should do and how to do it. I really need a step by step here..
Botswana:
bump. Not sure what all to do with this megger :x
bud16415:
Sorry for not getting back sooner.
You have found the problem to be in the one pump motor circuit and can now eliminate everything else we hope. So what do you have there a motor. Some wires running to it and some device telling it to turn on and then conducting the current to the motor. The megger can help you out with the motor and wires for sure if one or the other is intermittently going to ground very slightly. The tub needs to be shut down 100% and the things being tested need to be disconnected 100% so that’s removing the wires from the motor and removing the other end of the wires from whatever controls them. it is important the free ends are also not touching anything or each other. You need to also make sure you are not touching anything being charged during the test. This kind of wire is good for 600v+ so I would do the testing at 500v.
If you can rule out the motor and the wires then you are left with the control device. If there is a relay or motor starter that could also be tested if you can isolate it from the computer outputting the low voltage signal to the device. I would start with the simple part motor first then wiring.
There are dozens of video tutorials on line here is one. I found quickly. I would suggest watching a few as everyone relates differently to instruction videos. Be careful and the idea is to keep eliminating things one by one.
https://www.youtube.com/watch?v=TdeU6UCCfTY
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