I just got a 97 model Leisure Bay model #3100-7 and the High Limit switch keepws tripping and I could not get it to reset! I just got it today and the only thing running at the time I filled it up and put in the chemicals was the pump. Thanks for help

The high limit switch will trip out if there is inadequate water flow through the heater assembly and the heater is turned on. I've had this problem before as well and my solution is to turn the thermostat down to absolute minimum, fill the tub, apply power to the tub, and then run the jets on high for 15 minutes to help purge air from the heater assembly. Then, turn up the thermostat. A high limit breaker will not reset right away, they need to cool down first. This can take as long as 15 minutes or better, depending on if there is cool water in the assembly or not.

It worked after about 15 to 20 min's, So I tried turning the jets on high for about 30 min, and it tripped the high limit again>>>???

have you checked to be certain that you have water flow through the heater assembly? What temperature is the unit tripping out at? Next time it tripps, feel the heater housing, is it HOT? You might have a bad high limit sensor that is tripping at an extremely low temp. I have seen them fail at as low as 80 degrees.

I have a leisure bay spa and also am having this problem. Here are some things that I've learned along the way. The high limit switch is likely fine, but it is possible that it's bad. Most likely, as someone mentioned before, this problem is related to flow. The easiest thing to check first is try taking out the filter and seeing if it keeps tripping. If it doesn't than replace the filter - if it's old and are filthy dirty it will end up starving the heater for adequate flow causeing the water to overheat on it's way thru. Also, make sure all of your valve are completely open. If you're using a Nature2 or spafrog make sure that they are not restricting flow in the filter.

Now, where I think I have a problem with mine is a suction leak. My theory is that because almost every time I purge the filter of air there is always a lot of it, which means that there is a suction leak. This causes the air to push the water level lower and lower in the filter well, eventually starving the heater for water. This explains to me why it takes 15 minutes to trip... because it takes that long to build up that much air. Makes sense to me because if there was a flow problem it would be all the time, it would take 15 minutes if it was a heater or high limit switch issue. So, it's just a theory at this point, but keep checking your air purge too and see if it continues to collect air. If it does, you too have a suction leak.

Does your spa have a 24-7 circulation pump? If so, with only that running and pushing water thru the heater, does the high limit trip? If not, that's a good indication that when the main jets are on that's when you're sucking most of your air in causing the water starvation.

Anyone have any thoughts on this? Sounds logical?