My tub keeps tripping the breaker, but after it kools down I can trip the breaker back on, but it hits 100 and trips the breaker again, could this be the heater?

if your hot tub is tripping the breaker, it could be due to a worn out ground fault circuit interrupter (GFCI) breaker, which is responsible for preventing electrical surges. You can try flipping the breaker to see if it trips again. If it does, then you may need to replace the breaker.

Another possible cause of the problem could be loose electrical connections in your hot tub . This can lead to power fluctuations that cause your hot tub circuit breaker to trip. Professional electricians can inspect your hot tub and tighten any connections that are loose, which should fix the circuit breaker problem.

If your spa is not receiving power, you should check your home's circuit breaker to ensure that it's not tripped . Reset the circuit breaker if it's tripped to restore power to the spa. If the circuit breaker keeps tripping, it may be an indication of an electrical problem, and you should call a professional electrician to diagnose and fix the issue

Melisa, Breaker/GFI may be going bad. You may have to get an electrician to check for short or faulty motor/heater, etc. Check the attached links,instruction and guides, Good luck
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Troubleshooting tripping hot tub GFCI breaker
Hot tub GFI keeps tripping
Spa Circuit Breaker Mysteriously Tripping Any Clues Portable Hot Tubs amp...

It probably has something shorted to ground or the compressor or motors are stuck causing a high amperage problem. The breaker is probably fine but it also could be weak but normally its the compressor or a component has faulted to the compressor. If the unit immediately trips breaker its probably shorted to ground. If the unit struggles to start and a few seconds pass before it trips then it may be a component fault.

Because it is a GFCI. Try making sure that the grounds are all good. Maybe go the extra step of putting in grounding rods into the ground and grounding to the unit. These are just guesses.

it sounds to me like your hot tub has bugs take the control panel apart and clean the bugs out of it. if you have ants in the area they will get into the controls and cause it to trip out. i had similar problem with apump until i found the ants

A tripping circuit breaker is an indication of an overload. You say there is no load on the breaker - how are you making this determination? Are you using an amprobe or some other meter?

A circuit breaker with NO load shouldn't ever trip. Likewise a circuit breaker carrying up to 80% of of the current it is rated for shouldn't trip either. Circuit breakers that carry more than 80% of their load will trip - if the load remains connected long enough. This is called "duty factor" or "service factor" The greater the load is in excess of 80%, the less time that the breaker will carry it before tripping.

An example of a 100 amp breaker with different loads on it (this 100 amp value was chosen for ease of doing the math):

80 amps - never trips
85 amps - trips after 48 hours
90 amps - trips after 16 hours
95 amps - trips after 8 hours
100 amps - trips after 4 hours
105 amps - trips after a few minutes
120 amps - trips after a few seconds
150 amps - trips instantly

This is only an example to show how a certain circuit breaker might trip under a load less than the rating stamped on the body or handle.

A circuit breaker that trips with no load or a load equal to or less than 80% of its rating is most likely defective. You need an amprobe or ammeter for amp readings. If the load is found to be 80% or less, there may be an issue of harmonics that is causing the tripping. You'll need to have special equipment and qualified persons to check harmonic problems. Most harmonic problems occur when the loads are not linear device (transformers). Examples of non-linear devices are "switching" (or solid state) power supplies like those in computers.

I hope this helps and good luck. Please rate my reply. Thank you.

is your house running off 100 amps or 200 ?

You are exatly right. It's really not that uncommon for Older models to have faulty motherboards. Once you replace that, it should be working new.