The answer to 'thermostat freezing up' is that a frozen thermostat is often caused by a problem with the HVAC system's refrigerant levels or airflow. Symptoms include the thermostat display freezing up, the system not turning on, or the air being too cold. Solutions may involve adjusting the thermostat, checking for airflow blockages, or having a professional HVAC technician diagnose and repair the issue.
If your thermostat is freezing up, it's best to call in a professional HVAC technician. Trying to fix it yourself can be dangerous and may cause further damage. A qualified technician can properly identify and address the root cause to get your system working properly again.