There are several things that can cause this problem. The first is you just have a bad breaker, next is your heater unit is bad, lastly the pump motor could be bad. There is also the possibility that the motherboard is bad again.
SOURCE: 15 amp Gould breaker trips every 24 to 48 hours
As seemingly with everything else, these devices were once very reliable but now fail early in life.
Assuming that this is no GFI (Ground Fault Interrupter) equipped breaker, you must have a bad one.
If it is, you may have some stray currents tripping the breaker.
While finishing up on our new home and putting breakers in the main box for the first time, one brand new breaker refused to stay set even though the circuit was OK and no loads on that branch connected at all.
In the two years we have been here, we had to replace a second one acting just as you describe.
SOURCE: Main breaker tripping
replacing the main is a possibility and i saw someone suggestion to ck load on each leg of power , also a good idea but one thing i have also seen do this is a loose or corroded connection in the meter base or disconnect which causes a process called electrolysis that is a flaking away of the conductor itself in the meter base or disconnect feeding the panel main breaker and causing heat build up internal to breaker and making it trip but if you replace the main that is the time to check all these connection and it would not hurt to apply a little no lock or some other brand of oxidation inhibitor
SOURCE: Ground Fault circuit Breaker trips each time a load is applied
The most likely causes in their order of probability are: 1) water somewhere in the circuit causing the hot wire to ground; 2) a legitimate trip caused by a defect in a device plugged into the circuit; and 3) a defective GFCI breaker. In the first case, wait until it has been dry for about a week and see if it trips. In the second case, make sure there is nothing plugged into the circuit and try resetting. In the third case go ahead and put the regular breaker in, then put a GFCI outlet into the first box downstream from the breaker. If installed according to the directions, that outlet should protect all of the outlets downstream.
SOURCE: gfci breaker for spa
gfci's are designed to trip if they receive voltage on there ground/neutral side, therefore my vote is for Smithbrother I would say there is probably a partial short somewhere in you system.
SOURCE: arc circuit breaker won't reset
yes
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