Hayward Pool Heater


Sep 20, 2019
My Hayward electric pool heater is running, but the Set button does not change from Pool to Spa. The up and down temperature buttons are working properly. Any thoughts?


Silver Supporter
Jul 29, 2018
Katy, Texas
Wille, I can't say for sure since I can't see your equipment layout, but if it is like mine, I have one water in and one water out of the heater. Changing from pool to spa is done with the manual valves that are downstream of the heater. I fully open the spa in and spa out, and I fully close the pool in and out. That was what the pool builder said to do, and it works. Just be sure to change them back afterward.