hot tub won't shut off

[buddog]

Want to start out and say hello to everyone. We have had a used 2006 four winds cayman hot tub for about two years and have not had any trouble with it till now. It has balboa controls but lets say i drained and refilled it . At start up it go's into a two hour cycle it heats up the way it always has BUT it will not shut off the only way is to cut the breaker off whats going on

[goneaway]

Hi Buddog, welcome to the forum.
You say it heats up, the way it always has. ?
What in 2 hours ??

Mine takes about 1 hour per degree celcius.
So from a fresh fill, it will run for at least 24 hours to get up to full temperature.
During this time, the pump will continue to run.
The heater is buried inside the pipework so requires a water flow.