The Water Flow LED on my Edge-40 comes on about 10 seconds after switching on the SWG. I've tested the flow switch with a multimeter and it is working fine (~zero ohms between the two pins when the pump is on, open circuit when pump is off). It has been working fine for a about a year and a half and I've not snagged the cable or anything. Could it be because the water temp has dropped to ~8C or is this likely a problem with the control cox? (It didn't get this cold last winter). I couldn't find any troubleshooting tips on Circupool site.