Problem with ATO

MrsBugmaster · 12/02/2018, 01:40 PM

I have the Tunze Osmolator Universal 3155 Auto Top Off.The past 3 days now when I go look at my tank the water level is low and the top off controller "too low" is light up. I unplug it and plug it back and in it starts working and fills the sump back up to normal. So the pump is pumping again. Next day same thing. Is the problem with the pump or the controller?

rvitko · 12/03/2018, 10:27 AM

Too low means generally the pump has timed out. It is a 10 minute time limit. The pump could be failing (they typically need to be replaced after 2-3 years), the pump could be airlocked and unable to pump (tip it upside down to purge trapped air) or the water level could actually be very low, 10 minutes is equal to about 2 gallons of water, you can vary the pump speed and depending on head pressure it is 1-3 gallons. If too low comes on quickly, within about a minute, the controller was erased by harsh on and off switching (usually when connected to another controller) or by a power surge, we can reprogram the settings if you send it in. If too low is on with too high, this is the water damage indicator.

12/02/2018, 01:40 PM	#1
MrsBugmaster Registered Member Join Date: Nov 2008 Location: Indiana Posts: 182	Problem with ATO I have the Tunze Osmolator Universal 3155 Auto Top Off.The past 3 days now when I go look at my tank the water level is low and the top off controller "too low" is light up. I unplug it and plug it back and in it starts working and fills the sump back up to normal. So the pump is pumping again. Next day same thing. Is the problem with the pump or the controller? __________________ Mom of Army Hero 06 20 2011 Never Forgotten / Always Remembered Current Tank Info: Red Sea Reefer 170, my reef tank. 180 gal FOWLR tank Last edited by MrsBugmaster; 12/02/2018 at 01:46 PM.

12/03/2018, 10:27 AM	#2
rvitko RC Sponsor Join Date: Apr 2000 Location: Austin Texas USA Posts: 35,785	Too low means generally the pump has timed out. It is a 10 minute time limit. The pump could be failing (they typically need to be replaced after 2-3 years), the pump could be airlocked and unable to pump (tip it upside down to purge trapped air) or the water level could actually be very low, 10 minutes is equal to about 2 gallons of water, you can vary the pump speed and depending on head pressure it is 1-3 gallons. If too low comes on quickly, within about a minute, the controller was erased by harsh on and off switching (usually when connected to another controller) or by a power surge, we can reprogram the settings if you send it in. If too low is on with too high, this is the water damage indicator. __________________ Roger Vitko Tunze USA "He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!" Current Tank Info: 210 gallon planted tank with Altum Angelfish