A bit of a puzzler...I have an inground with an attached spa. The heater is a Hayward H310S model. I have automation with a Compool 3800 control panel.
My Compool panel has separate buttons for Spa mode and Pool mode. In Pool mode, I am able to adjust the temperature and kick the heater on. No problems there. But in spa mode, there seems to be nothing I can do to get the heater to kick on. The funny thing is, when I put it into service mode via the panel at my equipment pad, I have no trouble getting the heater to fire up whether in pool or spa mode. In automation mode (not service mode) I can never get the heater to fire when in spa mode even from the equipment pad panel.
I must be missing something obvious. I have no trouble heating the pool in 'pool mode'. The heater just doesn't want to fire up in spa mode unless the panel is in service mode.