We had to buy a Juwel automatic feeder for our Juwel RIO tank. The feeder is very simple to setup and use. When I turned the feeder on for the first time, I got a the red LED indicating that the device was on as described in manual. But after some ten seconds the red LED started flashing. I was surprised to find out that there was no mentioning about a red flashing indicator in the instructions manual, so I searched for a while on Google and found this forum and thread.
It turns out that the red flashing indicator on the feeder means that the drum is in the wrong position for it to be able to spin. Let me just say that the drum was in this position when I took it out from the package.
If you have this red blinking indicator on the Juwel feeder, gently spin the drum manually some degrees towards you or so that the text “Juwel aquarium” is pointing towards you. Then you can try by pressing the ‘M’ button to manually spin the drum. And for example test the amount of food it will dispense.
This is absolutely something that Juwel should have included in the instructions, but I hope this blog post will help you with the issue.