Sorry to hear that.
Actually, I returned that heater for another Jager; I assumed it was defective. The new one doesn't have the same problem; it works great! I even bought another one for my larger tank and it works fine as well.
It sounds like your heater may have the same problem mine had. If it's still within the return period you can exchange it for a new one. Or, if the heater works normally, aside from the temp offset, you could keep it. You wouldn't be changing the water temperature that often any how.
Personally, I would return it as defective and get a new one. These are excellent heaters if you get a good one. Very reliable and precise.
Last edited by ryancalif; 04-23-2013 at 02:18 PM.