I posted a thread the other day about my new Eheim Jäger 25W heater. I had to wait a few days to get my small holding tank for my Half-Moon so I could do a tank clean and calibrate the heater before I introduced him to a heated tank. Well I put the heater in the tank, submerged it vertically past the minimum level line. I then plugged it in...the light that tells me "hey I'm on" blinked on, then promptly went dark. It made me frustrated, especially because of all the wonderful reviews the heater has and now, some small fault in wiring (maybe) or sensor malfunction prevents the my betta from enjoying a nice warm tank. Any ideas other than returning it? Maybe some troubleshooting advice?