Pool and Spa
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That is the watchdog error code this usually means one or both of the sensors are bad. I would replace both the High Limit and temp sensor as when one goes the other is not far behind. Open the control box under the spa and locate on the circuit board where the sensors plug into board, usually in the top right, follow the wires back and remove and replace both sensors, then turn breaker back on and see if watchdog went away.