Rheem Pool Heater Error Codes. In cases where even after the button is reset and it still doesn’t work, the pcb should be replaced. Check to make sure that your pool heater is properly connected to the power source and that there are no electrical connection issues.

If this happens, you should call for service. When you are working on troubleshooting a pool heater, one of the most common culprits is the power source. If you're looking for help fixing your rheem furnace, look no further!