It was human (me) error on apex programming when redoing some dosing line pumbing.
I switched things around. Triple tested everything. Have a mechanical safety switch to ensure pump isn't on during maintenance.
Must have switched from doser-pump(off) to doser-pump(on) instead of (auto).
It still baffles me how I did that by mistake. Maybe my usual distracting kids bothered me at just the wrong time and I didn't notice till too late.
I switched things around. Triple tested everything. Have a mechanical safety switch to ensure pump isn't on during maintenance.
Must have switched from doser-pump(off) to doser-pump(on) instead of (auto).
It still baffles me how I did that by mistake. Maybe my usual distracting kids bothered me at just the wrong time and I didn't notice till too late.