What could be wrong with my hot tub it continuously shuts off it will not stay running.

either shorted heater element or pump motor bad unplug one at a time turn on see which one makes it blow

Unfortunately, I would have started with the sensors and then escalated from there. A hot tub is one of those items that I generally recommend hiring a technician to sort out, it's just flat not worth the headache of troubleshooting without the know-how.

As for your particular problem, the OH code on a Balboa control pack is "O.ver H.eating" it means that the heat sensor detected high temp and shut down to prevent damage to the system (as well as cooking you like a pink lobster) The sensor could be bad or the control board could be malfunctioning. A new sensor is $75-85 if memory serves me and is relatively easy to replace. one sensor is in the heating tube and the other is screwed into the tub shell to monitor tub temp. I would suggest new sensors, both of them because when one goes out the other usually isn't far behind. Make sure you shut the power to the tub off at the breaker box before doing any kind of tub repair. If you have shutoff valves on your tub you can replace the internal one without draining the tub. the one in the shell you need to drain to replace (at least to the sensor hole level) I hope this helps you to get your tub working properly again, if you still experience issues after this, I suggest biting the bullet and calling in a tech. Thanks for your question =)

pull the plug out of the wall ,its obviously has a faulty mains switch

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.

Rod
www.uspartscenter.com

Contact Maryland Hot Tub Repair @ 410-304-2463 or see their web site www.maryland-hottub-pool-spa-repair.com/ they specialize in Jacuzzi Sundance Service.

Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call

one of 2 things can do this,first unplug the unit from the power if it continues to fill then its the water fill valve thats bad,second if it stops filling when unplugged from the power outlet then its probably a plugged pressure switch line from the tub so the water pressure cannot switch the pressure switch diaphram from fill to wash cycle,open the cover and remove the pressure hose from the tub and blow into it and you will hear a click in the pressure switch its connected to,then replace hose onto tub side and blow into the other end of this same hose and make sure theres air movement in the tub as you will see and hear bubbling noise

Do you have a model and serial number so i can spec components and a diagram?
The reset is a GFCI electrical or a high limit temperature switch?
If its a GFCI you have a leak or a short or the pump is drawing to many amps likely due to something in the impeller or plumbing restricting flow. Potentially its a shaft seal issue.
How hot is the tub when it trips? Try running it cold and see if it trips. If it doesnt and its still cold its the pump. If its hot and you set it to cold its a stuck relay or contactor or triac and therefore tripping a high limit switch.
If this is a hot tub/spa the pressure switch may be an issue. It shuts down the heat typically and keeps the pumps running.
If a reset switch of any type is tripped to many times it will continue to trip at a lower and lower value.
Just some tips, hope they help. Get back to me with some info.

If it has the little oval off/on button, it sounds like the control box or off/on button is bad. If you have access to the pump assembly, follow the pump power cord to the little black box (zip tied to a tube up high), this black box has a small cable that goes to the off/on button. unplug the pump from the box and plug the pump into the power outlet. it should run continuously. If it runs, you need a new control box or /offon button. Buy the off/on button first, as this button is prone to water getting into it, and costs less than the control box.