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 second stage faster than the efficient fuzzy-logic algorithm (about 15-20min after first stage, if needed):

I am getting very low temperature readings from my thermostat but it is incorrect. What could be the cause?

This could be for either of two reasons. If the thermostat is being used in Fahrenheit scale, the Up and Down buttons may have accidentally been pressed at the same time, which changes the display to Celsius mode. To correct this, press and release the Up and Down buttons simultaneously again. Another reason could be that the temperature sensor has been bent. Pull off the faceplate and check the thermistor to see if it is damaged or bent over. The thermistor is a little device sticking up in the bottom right of the circuit board, it will be either blue or black.

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