We got a 2005 Sundance 850 Optima spa for free from a family friend. The hot tub seems to be having issues. We have the temp set at 98 and randomly it will run up to 105 and produce OH on the screen. While in the hot tub the heater seems to be continuously running and pumping out really hot water. I know the OH means over heat per the manual; so I turn the circuit breaker off for an hour or so and turn it back on. Temp drops to 102ish and the OH goes away and then heats back up and OH...
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