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When you say low pressure pump and high-pressure pump...?
Are you referring to low-speed water flow, and high-speed/Jets, waterflow?
do you have a one pump system with a two speed single pump? Or do you have two separate pumps?
Is one pump, which is normal, a two speed pump?
Answers to these questions, will help us, help you!
As I'm sure you know the low speed is the filtration & heating cycle. If you've checked the terminals on the board and on the pump & there's nothing wrong. Use a voltmeter to test if each leg is getting the right voltage. If not its likely the motor is bad.
these are a bear to work on.. there are start switches inside of the motor, and will break if you even look at them wrong.(fragile) you can try compressed air to blow out the trash that might be in the switch..or unhook power cord of the motor from the motherboard and remove the pump and motor from the spa , bring it to your local pool pump moor repair guy with free testing have it tested. if removing wires from motor YOU MUST REINSTALL THEM EXACTLY AS THEY CAME OFF ! OR YOU WILL BURN UP THE expensive 2 speed motor .. jay Florida
ok so when the pump is on high and the heater is running it doesent trip? you didnt say if it did. undo the heater leads so the pump is isolated completely. run the pump on the control centers gfci and see if it trips. if it does then try wiring directly - with an extension cord to a plug with a gfci in your house and see if it trips the gfci in your bathroom. if no trip inside house then bypass tubs gfci and run it with heater and pump through your bathroom gfci. if no trip then try and replace the tubs gfci, it gets pretty humid in the control center and gfci's have a semiconductor which which do fail after years of rough duty like that. if it trips the gfci in your house with the heater again it has a cracked heater element. craigslist always has old hot tubs and parts. you might have to buy a whole used old hot tub but that may be cheaper than a new heater box.
The jets will run while in the filtration / heating mode. If the spa is in the middle of the filtration cycle, the jets will stay on until the cycle time runs out. So, if the spa jets are on during this time, they are on for the full duration, 2-6 hours every 12. You can cycle the jet button to high, but when you try to turn them off, they will just go back on low.
You have a magnetek motor and it is overheating and cycling its thermal overload. A local electric motor repair shop may be able to fix it however it will likely need to be replaced. It is to costly to repair the motor if the damage is in the windings.
Assuming at that low a horsepower it is 115V, the likely replacement motor is a catalog #BN37. We sell it for $157. You are usually better off replacing the seal when you replace the motor and most Jacuzzi pumps are either a 200 or 1000. They should be around $5.