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Is there a way to force the second stage to come on?

If your equipment is 2-stage, first make sure your DIP switches are set correctly to allow second-stage operation. In order to bring on the second stage faster than the efficient fuzzy-logic algorithm (about 15-20min after the first stage, if needed):

1) set the heating or cooling setpoint at room temperature and let the display return to normal operation.
2) move the heat or cool setpoint up or down three degrees. After normal protection time-outs have been satisfied (2 or 4 minutes depending on your configuration), the thermostat will start the first stage.
3) Once the first stage is running, adjust the setpoint three more degrees in the same direction. The second stage will start.

This method bypasses the thermostatic control algorithm for this single heating/cooling cycle.