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Blower Motor Keeps Running: Causes, Solutions, and Maintenance Tips

If your blower motor keeps running continuously, it could be due to a thermostat set to “ON” instead of “AUTO,” a stuck relay switch, or a malfunctioning fan limit switch. Other potential causes include wiring issues or overheating of the furnace. Checking the thermostat settings and inspecting the electrical components can help diagnose the problem, but consulting an HVAC professional may be necessary for a proper fix.

When your blower motor keeps running continuously, it can be both a frustrating and confusing issue. This component, essential for circulating air through your HVAC (Heating, Ventilation, and Air Conditioning) system, is designed to turn on and off in cycles, depending on your thermostat settings. However, if it runs nonstop, it can lead to increased energy bills, unnecessary wear and tear on your system, and uncomfortable indoor conditions.

In this detailed blog post, we’ll explore the potential causes of a continuously running blower motor, how to diagnose the issue, solutions to fix it, and preventive measures to keep your system in good working order.

Causes of Blower Motor Keeps Running

If your blower motor keeps running, several potential issues could be the cause. Below are the most common reasons, along with explanations for each.

1. Thermostat Settings

2. Thermostat Malfunction

3. Relay Switch Issues

4. Fan Limit Switch Malfunction

5. Stuck Contactor

6. Wiring Problems

7. Dirty Air Filter

8. Furnace Overheating

Diagnosing the Problem

When faced with a continuously running blower motor, diagnosing the problem involves a systematic approach to identify the root cause.

  1. Check Thermostat Settings: Start by verifying that the thermostat is set to “AUTO” and not “ON.” If the setting is correct, move on to other potential issues.
  2. Inspect the Thermostat: Adjust the thermostat temperature and observe if the blower motor responds appropriately. If not, consider testing the thermostat or replacing it.
  3. Test the Relay Switch: If you’re comfortable with electrical work, test the relay switch to see if it’s stuck in the “on” position. If you’re unsure, contact a professional.
  4. Examine the Fan Limit Switch: If the blower motor continues running despite the furnace being off, the fan limit switch may be the culprit. This requires professional inspection.
  5. Check the Contactor and Wiring: Inspect the contactor and wiring for any signs of wear, corrosion, or damage. Replace or repair faulty components as necessary.
  6. Inspect the Air Filter: Ensure the air filter is clean and free from obstructions that could cause the blower motor to overwork.
  7. Consider Overheating Issues: If you notice that the blower motor runs excessively after the furnace has been on, overheating might be the issue. Turn off the system and call a professional.

How to Prevent Blower Motor Keeps Running

Preventing your blower motor from running continuously involves regular maintenance and addressing minor issues before they escalate.

1. Regular HVAC Maintenance

2. Monitor Thermostat Settings

3. Replace Air Filters

4. Address Electrical Issues Promptly

Conclusion

A blower motor that keeps running can be a sign of various issues, ranging from simple thermostat settings to more complex electrical or mechanical problems. By understanding the potential causes and following a systematic approach to diagnose and address the issue, you can prevent unnecessary wear and tear on your HVAC system and maintain a comfortable home environment.

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