Thermostats are essential in maintaining indoor comfort year-round, acting as the control hub for your home’s heating and cooling systems. When an error code suddenly appears on the thermostat display, it can be both confusing and alarming. These codes are designed to alert you to potential issues within your HVAC system. Understanding what each code means can make troubleshooting easier, help you resolve minor issues on your own, and inform you when it’s time to contact a professional.