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I'm going on somewhat limited information here not knowing if the tub is newly installed or if this is a spa that has been working in the past and just started doing this. It would be helpful to know if this is a recently installed pump as well. That said here are a few things to check. If it's a new install: Your electrician has more than likely wired the spa incorrectly. Be sure that the spa pack has 220V going into the pack and that the GFCI is wired correctly. If it's an old spa with a new problem: A lot of times a bad heater element can cause a spa to trip the breaker. If you have a bad element the spa will operate normally for about a minute when you turn the power on, then trip the breaker as soon as the heater kicks in. If it only trips the breaker when the pump is turned on to high speed, more than likely there is a problem with the wiring of the pump or the relay on the pump itself.
Mold on your jets can come from a variety of places but due mostly to the bacteria in the tub. There are several kinds of cleaners to use in the meantime once you get your trim clean so you can prevent what you are experiencing. Take the trim off and clean them in your sink. DO NOT put them in the dishwasher as it is too hot and will ruin your trim. Here is a link to our site that has different options for cleaning the pipes and keeping the jets from getting yucky. Maintenance Products
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws. But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position. Be sure to mark the turns down on a piece of paper. That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started. Make sure your spring that goes on the idle screw is in place. You can also use some "locktite" thread locking compound on the threads of the needle if the spring is missing. Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position. Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM. The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm. Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed. Alway use the "lightly seated" method if you have not changed the screw settings. Please take time to rate me Bud
This is sounding like a relay not working on the circuit board inside the control box. You will want to have a Kohler service center send someone out to have it checked. You most likely need a new control box.
This may be due to clogged jets. Also, if this is a new application....the valves under the spa may not be in the up position to release the water to run into the pump and through to the jets. It may be a top side control issue as well. Check for error codes.