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It is pulling more amperage than the GCFI can handle and it has to work harder when someone is in it thus causing a higher amperage draw. If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

tHE WIRING or something might be messed up

There are several options for cleaning the piping on a jetted bathtub. The reason you have a residue on the bathtub surface when you are done bathing is because there is bacteria built up in the plumbing of the jetted tub. In order to remove that and reduce the amount of "yucky stuff" coming into the tub when using it, we recommend a regular usage of a jet cleaning product about once every couple of months Here is a link to the cleaning products I can find right now. There may be other out there that I am not aware of but I do know these products work well in all jetted bathtubs. US Parts Center

There currently is no option for closing the jet openings for any jetted bathtub produced.US Parts Center

It is always possible to add a heater to any jetted bathtub at any time.What you need to find out that is if the tub is plumbed to each jet with rigid PVC pipe or flexible PVC pipe. If it is plumbed in flex pipe then the Tee heater will be easier to install however if it is plumbed in rigid PVC then I would suggest a inline pressure heater that you will install in the water line any place after the discharge of the pump.Here is a link to a installation instructions so you can see how all heaters are installed.US Parts Center

There is a blue cap on the body of the white pressurized water tank. Twisting off the blue cap, you will see a air nozzle - similar as those on the tire. You need to pressurized the tank to 60 PSI. I spend hours to figure out this solution on my own system.

most likely there is a switch that is burned out. on the lid there is a peg and that peg goes down in the hole and triggers the switch to let the machine know the lid is closed. romove the front panel (should just pull off) this will expose screws to remove top. switch will probably have burn marks on it. replace it.

I think it is manufatured by Nordic.?
this link should help you will all the installation use and repair.
http://www.nordichottubs.com/owner-center/default.aspx

let me know if this is not the one.
please post additional comments in this thread.

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