Hi,
What we recommend is to have the thermostat probe taped directly to the surface of the UTH between it and the tub - that is why you are seeing it run full on all the time I suspect.
You generally have to have the thermostat set a few degrees higher than the desired temp to get it spot on inside the warm end hide.
The general method is to put the thermometer probe right on the surface of the bottom of the tub underneath the substrate and adjust the thermostat until you get a thermometer reading of 93-95f.
Then you adjust the type/ thickness of the substrate until the temp on the surface of the substrate inside the warm end hide reads 90-93f.
You then check to see what the temps are on the surface of the sybstrate inside the cool end hide. If they aren't in the 80-82f range then you need to think about a little extra tweaking and possibly adding a second UTH connected through a dimmer or raising the ambient room temps.
What kind/ depth of substrate are you using at the moment?
dr del
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