I have an atmospheric above-ground pool heater. Heater is 2 years old, this is our 3rd summer using it. Water is not heating. Display says "rollout switch open". Manual says this is displayed while their is a demand for heat. I am wondering if anyone else has encountered this issue, and what needed to be done to return heat to the pool. I have turned off heater, unplugged, plugged back in and turned heater back in. Heater appears to be in working order, just not producing heated water. Any suggestions?
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