Yes, a malfunctioning thermostat can indeed cause the fan not to work properly. The thermostat acts as the control center for your HVAC system, including the fan. If the thermostat is faulty, it may not send the proper signals to the fan, preventing it from turning on or functioning at the desired speed. A bad thermostat can also cause the fan to run continuously or not turn off when it should. To ensure your thermostat is functioning correctly, it is recommended to consult with HVAC Alliance Expert's specialists. Our team offer professional thermostat repair services and can assist you with any HVAC or AC-related issues. Learn more about Our thermostat repair services • here.