I have a GE two speed motor/pump for a hot tub that I have adapted for a type of therapy called underwater pressure massage (all of the hot tub jets are channeled through a single hose for the high pressure underwater massage) Recently I took the motor to be reconditioned after it was tripping the GFI. Now the motor runs fine at low and high speeds under normal conditions. However when I switch the hot tub from the regular hot tub jet function to the high pressure underwaterpressure massage it trips the GFI after about 5 seconds. I went back to ask the repair shop for their opinion they said that the high pressure usage should not cause the motor to trip the GFI. Their suggestion; it might that repeated tripping the GFI before the motor was reconditioned may have cuased the GFI to become oversensitive and the Bryant 50 amp 2 pole breaker with GFI may need to be replaced. Is there any way to test this idea? Any suggestions on other things to check?

Disconnect both hot leads from the breaker at the box. Using an ohmmeter measure the resistance to ground or the neutral bar in your box. If the resistance is LESS than about 50 K you have excessive leakage current. It is unlikely the motor is the problem. I would check the wiring and switching for the leakage. Now to the second problem: If you switch between speeds while the unit is running, the GFI will LIKELY trip. This is normal as you create a massive transient that the GFI PROBABLY can't handle. There are a couple things to try: One is using a two pole control switch and turn off the pump before "switching gears" ... as an electrical engineer I can't explain this unless you can understand electrical transients AND capacitive coupling between the windings and the case of the motor. I realize you may have a combination speed and on off switch so you MIGHT have to add a switch. Ideally I would want a relay for on/off near the breaker that momentarily disconnected before shifting gears. The next fix possibility involves a trick we use to control transients in electronics. This involves noise control by using a toroid around the pair of hot wires. This MIGHT take several turns through a good sized ferrite toroid with both the hots in the same direction, side by side. This forms what we call a "Bi-Filar" choke. Look that up on Google to understand the principle... it essentially helps balance the currents in the hots and isolates them from ground for transients.