Problems with Tunze Osmolator 3155 ATO

[Water Dog]

In order to stop this from happening, make sure the hose outlet is always above the water level in the ATO reservoir.

 

[Philt56]

Thanks, was thinking the high “hump” in the hose would stop a siphon.
Crude pic.

 

[Water Dog]

Hump doesn’t matter... the end of the hose relative to the level in the reservoir does!

 

[PhilT]

Any ideas on fixing tunze osmolator? The sensor for filling doesn’t seem to detect that it’s dry. I wiped it with vinegar the other day and it seemed to fix it but return pump sucking air again today. Tried wiping again and it just did a couple short bursts of water then stopped. Also looks like the sensor is hardwired in the controller box so not sure if replaceable? The pump does run when I unplug and plug back the power like it’s supposed to. So I think the pump is good?