There are several possible causes for a furnace blower not kicking on. One common issue could be a wiring problem or a tripped circuit breaker. If the circuit breaker has been tripped, it means that there is an electrical issue causing too much current to flow through the circuit. This can be a safety mechanism to prevent damage to the furnace or electrical system.
Another possible cause could be a motor problem. If the motor is faulty or damaged, it may not be able to start and spin the fan. This could be due to a mechanical issue within the motor or an electrical problem such as a burnt-out motor winding.
While it is possible that the thermostat could be at fault, it is more likely that the issue lies with the wiring or motor. The thermostat is responsible for sending a signal to the furnace to start the blower, but if the blower does not respond, it is typically not a thermostat problem. However, it is always best to have an HVAC technician diagnose and remedy the issue to ensure an accurate and proper solution.
In my personal experience, I once encountered a similar issue with a furnace blower not kicking on. After checking the circuit breaker and finding that it had not tripped, I called an HVAC technician to inspect the system. They discovered that there was a wiring problem causing a connection issue between the thermostat and the furnace. Once the wiring was repaired, the blower started working again.
To summarize, if your furnace blower is not kicking on, it is likely due to a wiring issue or a motor problem. While the thermostat could be a potential culprit, it is best to have a professional HVAC technician diagnose and fix the issue to ensure a proper solution.