Pool and Spa
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This means one of the sensors picked up a high temp fault...likely when insufficient water went through heater and boiled...
If turning power off and back on does not clear it you will need to replace temp sensor.
When doing this I would replace all sensors if you have more than one one.
I do not know which spa you have, but generally they are in wells in the pipe entering or leaving the heater assembly.
do you know which model Gulf Coast?
see choices here