1. Thermostat Issue:
- Check if your thermostat is set to "Auto" or "On". If it's set to "Fan On" or "Continuous Fan," the blower will run continuously, regardless of the temperature setting.
2. Faulty Limit Switch:
- The limit switch, also known as the high-limit switch, prevents the furnace from overheating by shutting off the blower when a certain temperature is reached. A faulty limit switch may be preventing the blower from turning off.
3. Control Board Problem:
- The control board is the brain of your furnace and manages various components, including the blower. A malfunctioning control board can disrupt the normal operation of the fan blower.
4. Blower Motor Capacitor:
- The blower motor capacitor helps the motor start up and maintain speed. A faulty or damaged capacitor can prevent the motor from turning off.
5. Blower Motor:
- The blower motor itself may be faulty or burned out, causing it to run continuously.
If you're uncomfortable troubleshooting these issues yourself, it's best to contact a qualified HVAC technician to diagnose and fix the problem safely and accurately.
