Oh, I gotcha now. My apologies for not understanding. Yes, my Tunze always pumps water into the tank... The only way I know how to stop it is to not use the Defer command at all, let the float switch get flooded and let the alarm go off. It will only last for the time it takes to fill the sump, then when the float switch goes to normal and the optical sensor can see if water is needed, then it will add water.When your power is turned back on to your Tunze after the defer does it pump water into your tank as the tunze boots up? I understand the programming. My question is to how to prevent the ATO from dumping water into the tank as the unit boots up. I feed several times a day. If I turn off the ATO with each feed then the ATO will dump water into the tank each time it boots up
Sorry I am confused.
I get your frustration, for some reason the Tunze ATO controllers are programmed to dump water in when turned back on, THEN sense whether it's needed. I get so frustrated by that sometimes, because it just dumps water, then my float switch goes off, the beeping noise starts and I manually turn it off. I know there is a way to disable the high alarm, but I don't want to, even though I have two other floats on the sump to measure hi/lo and a third at the very top of the sump in case something really weird happens... thinking of getting a new ATO controller next time I need one....
I am going to just keep my ATO on while feeding to avoid the issue. Great point @recess62