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Sounds like the heating element has gone out again. Once you reset the circuit breaker and the tub turns on it will start to circulate the water. This usually runs like this for about 2 mins and then the tub will recognize it is cold and send power to the heater. If the element is back at that point it will blow the circuit breaker. If this circuit breaker pops as soon as you turn it on then you most likely have a bad circuit board.
does it blow a breaker? check to see what is going on by unplugging all the pumps, blowers lights and anything else plugged into the circuit board (heater too) turn the breaker on once everything is unplugged and then proceed to turn the spa off, plug one item back in and turn the breaker back on. Do this until you find the buzzing....
You may actually have a back relay on the circuit board causing the buzzing by not latching in when the pump or something is trying to come on.
Did you try an electric motor rebuilder? $500 seems too high to repair a motor. Motors have either a capacitor or dual windings to get them started and it sounds like yours has failed. Get the numbers off the MOTOR and call a motor rebuilder in your area for pricing.
Unplug tub from GFI, does GFI hold, plug something else into GFI to see if it holds under load. If all is ok then make sure you have a good ground from the motor to the GFI and the polarity is good. If 120 vac black wire to gold post, white wire to silver post and ground to green. Check proper connections, including polarity and ground at tub junction box and at pump motor it self.
I take it for granted that you know when the tub is in cycle mode for water circulation, ( the tub will do this every 4 to 8 hours unless programed otherwise). If it is truly going into the low speed on the pump, the problem lies in the circuit board. The double click you hear is the relay for the pump turning off and then on again. This is a costly problem to diagnose as circuit boards start at 200.00 and go up. If it is the relay, the only way to replace one is to replace the circuit board.
you don't have a circulating line in it,, there for it is pulling the hot only,, when you have the 2 systems you have to have it circulationg or take 1 out, it being it is hot water they will vapor lock,, meening no hot water , you could get a circulating pump that actually hooks to the cold and hot side under the sink far away from the water heater and it has a timer on it that will circulate the water at certain times of the day,,, this would solve your problem
Once the heater is installed and the whirlpool pump is operating, the heater is totally automatic. The heater will help maintain the temperature of the water in the bath. The heater is equipped with a preset pressure switch. The pump must be running with water flowing in the whirlpool to allow the heater to turn on. The Indicator Light light turns on whenever the heater is operating. The heater includes an exclusive "Intelligent High-Limit". This safety circuit will not "false trip" from hot tap water. It will only turn the heater off if the thermostat fails. If the high-limit trips frequently, call a service technician. To manually reset the circuit in the event that the "High-Limit" switch has been activated, simply (1) Turn off the whirlpool pump. (2) Drain water from the tub. (3) Remove power from heater by unplugging at receptacle or turning off circuit breaker. (4) The heater circuit will automatically reset in less than 15 minutes. (5) Restore power to the heater. (6) Whirlpool bath is now ready to use.