Pool and Spa
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It sounds like your error messages are Over Limit and Overheat sensor errors. Most likely this is caused by the pump that is not working that flows water through the heater itself, If this pump is bad the water in the heater could be heating up and not moving so it throws an error code. Now I have seen this also be a bad set of sensors but since you stated there is a circulation pump not working then it is most likely that pump. Remove and replace the pump.
OK great let me know how it works out
Everything looks good from what I can see. How did the pump issue go?