Eheim running...backwards! - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 06-11-2014, 09:55 PM Thread Starter
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Eheim running...backwards!

I just finished rinsing the filter media in my Eheim, no big deal. Put the top back on and now the filter runs backwards. As in the water comes out of the filter from the intake tube and tries to suck water from the tube that returns the water into the tank. I have triple checked everything, it should work fine. It is like the impeller is now going in the opposite direction. What is weird is that my Koralia (in tank) water circulator has done this at times too. The impeller on that will spin backwards. I beginning to think my tank is possessed! On top of this earlier today my pleco spooked at something and banged his head. Now he is up-side-down and swimming in circles. I'm not having a good day. How, how do I fix my Eheim Ecco to run properly?
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post #2 of 8 (permalink) Old 06-11-2014, 10:21 PM
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The first obvious question is, are you sure you have the tubes connected to the correct places? This may sound stupid, but it's not too hard to do.

Even if the impeller did spin backwards, the flow would usually be in the original direction, just lower. Think about how such pump works.

Sometimes I've pulled the head off and tested it in a bucket when I thought I had a problem, but it was a different Eheim model.
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post #3 of 8 (permalink) Old 06-12-2014, 04:45 PM
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Follow the advice about making sure you hook up the right inputs and outputs.

If it is truly running backwards, you need to get a electrician in your house right away.

AC motors can not run backwards unless they blow a capacitor. They will only blow a capacitor if they receive a electrical strike or corrupted current.

Given the behavior of the fish, you might have a electrical short in the tank.
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post #4 of 8 (permalink) Old 06-12-2014, 04:50 PM
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Quote:
Originally Posted by DaveK View Post
The first obvious question is, are you sure you have the tubes connected to the correct places? This may sound stupid, but it's not too hard to do.
I've done this a few times.





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post #5 of 8 (permalink) Old 06-12-2014, 05:57 PM
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I've done this a few times.

me to, made one heck of a mess in my 8.7g


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post #6 of 8 (permalink) Old 06-12-2014, 06:51 PM
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You didn't move to the Southern Hemisphere, did you? Seriously, I have to believe the tubes are reversed. Sounds like something I'd do.
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post #7 of 8 (permalink) Old 06-13-2014, 05:16 PM
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Impeller driven motors can start going backwards but usually disconnecting and reconnecting the power a few times gets them running in the right direction again. Do check your pipes though.
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post #8 of 8 (permalink) Old 06-14-2014, 01:54 AM
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This really isn't a big mystery and can happen on filters or powerheads. It is a small point on the impeller that needs a check. Some background on how mag drive work will help to make sense. The current flowing through a coil around the impeller makes an Electromagnet. The impeller also is a magnet made up of alternating sections of positive and negative. So if the power comes up and a positive pole is attracted to the correct portion of the impeller, it starts spinning the correct way. If it happens that a negative comes up, the impeller portion will be pushed rather than pulled for that 1/60 second until the AC flow reverses. Looking at an impeller carefully , you may see that there is a small stop of some sort to stop the impeller from starting the wrong way if the power comes on reverse of what is needed. It is designed for the impeller to bang into the stop, pause and then as the power reverses, the impeller goes the right direction.
When your mag drive goes the wrong way, the little stop is not there. Often broken off. Some people get by with repeatedly plugging/ unplugging until they hit it at the right time.
I favor fixing the stop or replacing the motor.

I believe on the Koralia it is a small rubber tip stuck on a small nub of plastic on the cage? Been a while since I looked at one. Could be wrong about that.

Last edited by PlantedRich; 06-14-2014 at 02:00 AM. Reason: addition
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