The answer to 'why is my thermostat not working' is that there could be several common causes, such as a dead battery, a wiring issue, or a problem with the thermostat itself. Some of the most common symptoms include the display not turning on, the system not responding to temperature changes, or the thermostat not properly controlling the HVAC equipment.
In many cases, you may be able to troubleshoot and fix a malfunctioning thermostat yourself. Start by checking the batteries and replacing them if needed. Ensure the thermostat is properly wired and connected to the HVAC system. If those basic checks don't resolve the issue, you may need to replace the thermostat. However, if you're not comfortable working with electrical components or the problem persists, it's best to call in a professional HVAC technician to diagnose and repair the issue.