Hey all, could use a little help here. I have been using the DOS for probably a year and a half now for AWC (changing about a gallon per day). I was doing some maintenance last night and it kicked on and it was really loud. I went to my fish room and saw it was stuck. Trying to turn but just clicking back and forth. I took the head off and nothing seemed amiss, out it back together and pressed the buttons to advance the head. It worked fine. A little while went buy and the awc kicked on again and the same thing happened.
Is this a sign of needing to replace the head?
Thanks,
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