I've got a pentair minimax heater and i7 controller.
It seems that when I hit the "spa" button, the heater fires up and reaches or exceeds the target temperature. As the water starts to cool, the heater does not readily fire up again.
I was told by Pentair that it is normal for the heater not to fire up until the temp falls 3-4 degrees below the target, but this seems excessive.
Anyone with advice about what might be the issue here?