Tunze Osmolator 3155 Issues

Rollinreefer80 · Dec 5, 2019

I am reaching out to the Reef2Reef community to see if anyone can help me. I currently just setup my 120 and I started using a Tunze 3155 Osmolator ATO that I had for about 3 years from the previous setup. When I installed the ATO the pump came on and filled the water to the sensor. 2 - 5 minutes later it would start to fill again adding about another 1 1/2 gallons of water and triggering the high alarm switch which activates the high alarm ( drives my wife crazy). Cleaning the sensor with vinegar did not help. After about a month of battling this problem I bought another one yesterday and set it up today. Unfortunately, it is doing the same thing with a new unit. I have even used my old bracket to set the high alarm switch at a higher level because the pump will not shut off at the sensor point, it just overfills completely submerging the sensor. I do not know what I am doing wrong but I don't remember having these issues before. If anyone has any recommendations on how I can solve this issue I would greatly appreciate it.

lapin · Dec 5, 2019

One idea: sensors upside down?

xabo · Dec 5, 2019

lapin said:
One idea: sensors upside down?

Could possibly have the "float" upside down.

Brian1f1 · Dec 5, 2019

You hand wire it. Maybe it’s not wired correctly. @rvitko can prob help.

tautog83 · Dec 5, 2019

Agreed, with the above posts . Stop and think what are the chances of both units having the same problem.. that's how I realize im overlooking something silly. I mean it can happen obviously but retrace the steps

Rollinreefer80 · Dec 6, 2019

lapin said:
One idea: sensors upside down?

Nope, both sensors are installed correctly.

SPR1968 · Dec 6, 2019

I had the same problem with mine after about 3 years a few weeks ago. The pump didn’t switch off but I caught it.

When you switch it on it does a self test and I seem to remember that the first light comes on for about a second and mine was red which meant optical sensor fault. There’s a thread on RC I think with a similar issue if you do a search which is were I found it.

I actually removed the entire system thinking it was broken and left it in a box although I did wipe the optical sensor again

I tested it again last week and it worked so I’m thinking maybe the sensor was dirty or something stopping it detecting water. I know there is an issue if you get micro bubbles on the sensor which can also happen when there new because of a slight ‘film’ on the sensor

Just also check you don’t have a siphon issue that’s causing a problem.

BayouReefer · Dec 6, 2019

Is your sump level constant maybe your return pump is surging. Water returning from overflow maybe getting hung up in return piping before it gets back to the sump then hits sump all at once increasing level

Rollinreefer80 · Dec 6, 2019

Thx SPR168 and BayouReefer I will check both your suggestions when I get home.

lapin · Dec 6, 2019

Rollinreefer80 said:
which activates the high alarm ( drives my wife crazy).

I forgot to mention you can turn this off inside the unit as well as adjusting for ATO size

Be102 · Dec 6, 2019

lapin said:
I forgot to mention you can turn this off inside the unit as well as adjusting for ATO size

Can you turn off the startup alarm? Like when the outlet turns on?

lapin · Dec 6, 2019

Be102 said:
Can you turn off the startup alarm? Like when the outlet turns on?

When you turn off the alarm it turns off both. There is no way to turn off one or the other as I recall

Tunze Osmolator 3155 Instructions For Use Manual (Page 25 of 37) | ManualsLib

www.manualslib.com

Be102 · Dec 6, 2019

lapin said:
When you turn off the alarm it turns off both. There is no way to turn off one or the other as I recall

Will check it out, thanks!

adrianr514 · Jul 7, 2020

Did you ever figure this out? I have the same issue we’re the optical sensor does not trigger the controller off and it keeps filling until the backup float triggers the stop.

... · Jul 7, 2020

Just buy an XP Aqua Duetto and stop this problem

Letterkenny · Jul 7, 2020

... said:
Just buy an XP Aqua Duetto and stop this problem

How long have you had your XP Aqua Duetto? I actually just ordered one since it was recently on sale but I recently started having this issue with my 3155 in my old tank. Would like to hear if there is a solution as well. Note in my old tank, it used to work fine and now has stopped working with this issue without ever moving it.

... · Jul 7, 2020

Maybe its just old? If you have an apex get an optical eye from them and use that, I think it works, I have no ATO but I will get one soon and I was going to get a tunze but lately they seem to be inefficient?

Letterkenny · Jul 7, 2020

... said:
Maybe its just old? If you have an apex get an optical eye from them and use that, I think it works, I have no ATO but I will get one soon and I was going to get a tunze but lately they seem to be inefficient?

Mine is circa 9 months old so shouldn’t be an issue.

Water Dog · Jul 7, 2020

Have you guys tried getting in touch with Roger, NA Tunze rep? He’ll help you trouble shoot the problem and will have you back up and running. His customer service is second to none.