The answer to 'why is my thermostat not heating' is that there are several common causes, including a faulty thermostat, issues with the HVAC system, or a problem with the home's electrical wiring. Symptoms may include the thermostat display being blank, the system not responding to temperature changes, or the home not warming up as expected.
Some potential solutions include checking the thermostat's batteries, ensuring the thermostat is properly connected to the HVAC system, and verifying that the system's circuit breaker or fuse is not tripped or blown. If the issue persists, it's best to call a professional HVAC technician to diagnose and repair the problem, as they have the expertise and tools to properly identify and fix the issue.