I had a power outtage due to a storm. Our geothermal unit is running but not cooling. I have reset the thermostat and the fan in running, but the temperature is not dropping.
What's my next step?

Turn the beaker off going to the system for about 10 seconds and then back on, this will reset the control board. If you have a split system geothermal you will have to kill power at the fan coil and compressor unit to get it to reset.

Thanks I will try that. It's 90 degrees here, so I appreciate the quick response.