Not go higher on the digital readout or not go higher with the plugged in heat source? Are you sure the thermostat is bad and not the heating element? If the digital readout will not allow you to program it above 80 that is one thing but if the displayed temp is stuck at 80 yet you can set it higher the UTH or other heat element might be bad.
You can rule this out by getting a light plugged in and putting the probe near the bulb.
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