A furnace is essential for maintaining indoor comfort during cold months. However, when the fan motor keeps running continuously, it can lead to problems such as higher energy bills, increased wear on components, and inconsistent heating. Many homeowners face this issue with the Carrier Furnace 58GSC065-110DB fan motor keeps running troubleshooting process, which can be frustrating if you don’t know where to start.
In this guide, we will explore the common causes behind this problem and effective troubleshooting methods to fix it.
Why Does the Fan Motor Keep Running?
When your furnace fan motor continues running even when it should turn off, several factors could be responsible. Here are the most common reasons:
- Thermostat Issues – Incorrect thermostat settings or malfunctions can cause the fan to stay on.
- Fan Limit Switch Malfunction – The fan limit switch controls when the fan turns on and off. If it’s faulty, the fan may run continuously.
- Control Board Problems – A defective circuit board may send incorrect signals, keeping the fan running.
- Stuck Relay – If the relay that controls the fan is stuck, it will prevent the motor from shutting off.
- Short Circuit or Wiring Issues – Damaged or faulty wiring can send continuous power to the fan motor.
Troubleshooting the Constantly Running Fan Motor
If your Carrier furnace fan motor is running non-stop, you can perform a few troubleshooting steps before calling a professional.
-
Check the Thermostat Settings
- Start with the thermostat since it plays a major role in controlling the fan operation.
- Ensure that the fan setting is on “AUTO” and not “ON.”
- If the thermostat is battery-powered, replace the batteries.
- Test the system by lowering the temperature setting and waiting a few minutes. If the fan keeps running, move on to the next step.
-
Inspect the Fan Limit Switch
- The fan limit switch controls when the fan starts and stops. If it is stuck or malfunctioning, the fan will run continuously.
- Locate the fan limit switch near the furnace blower.
- Check if the switch is set to “MANUAL” instead of “AUTO.” If it’s on “MANUAL,” switch it back to “AUTO.”
- If adjusting the switch doesn’t solve the problem, it may need to be replaced.
-
Reset the Furnace
- Sometimes, a simple reset can fix electronic issues.
- Turn off the furnace using the power switch.
- Wait for 5 minutes before turning it back on.
- Observe if the fan shuts off after the furnace completes its cycle.
- If the fan still doesn’t turn off, further troubleshooting is required.
-
Check the Control Board
- The control board regulates fan operation by sending signals to start and stop the motor. A malfunction in this board can cause continuous operation.
- Look for error codes on the control board. These codes can provide clues about system malfunctions.
- If there are no visible issues, but the fan still runs non-stop, the board may need professional diagnosis or replacement.
-
Examine the Fan Relay
- The fan relay switch is responsible for controlling the electrical connection to the fan motor. If it gets stuck in the closed position, the fan won’t turn off.
- Locate the fan relay in the control panel.
- Tap it gently to see if it releases. If the fan turns off, the relay is likely the problem and should be replaced.
-
Inspect Wiring and Connections
- Faulty wiring can cause electrical issues, including a constantly running fan.
- Look for any loose or burnt wires around the fan motor and control board.
- If you notice damaged wiring, it’s best to have a professional technician repair it.
-
Test the Furnace Blower Motor
- The blower motor itself could be stuck in the “ON” position due to an internal failure.
- Turn off the furnace and disconnect power.
- Try spinning the fan blades manually. If they don’t move freely, the motor may be faulty.
- If the motor is overheating, making unusual noises, or showing signs of wear, it may need replacement.
Preventive Measures to Avoid Future Issues
Once you fix the issue, take preventive measures to keep your Carrier furnace in good working condition.
- Regular Maintenance – Schedule annual furnace inspections to catch potential problems early.
- Keep the Thermostat in Good Condition – Clean and calibrate the thermostat periodically to ensure accurate temperature control.
- Avoid Harsh Electrical Surges – Use a surge protector to prevent damage to the furnace’s electrical components.
- Replace Air Filters on Time – Clogged air filters can overwork the fan, leading to premature wear.
Conclusion
The Carrier Furnace 58GSC065-110DB fan motor keeps running troubleshooting process involves checking key components such as the thermostat, fan limit switch, control board, and wiring. Many of these problems can be fixed with simple adjustments, while others may require component replacements. By following these troubleshooting steps, you can identify the cause of the issue and take corrective action. Regular maintenance can prevent similar problems in the future, ensuring your furnace operates efficiently.
FAQs
Why won’t my Carrier furnace fan turn off?
A thermostat setting on “ON,” a faulty fan limit switch, or a control board issue could be causing the fan to run continuously.
How do I reset my Carrier furnace?
Turn off the power switch, wait 5 minutes, and turn it back on. This can help resolve minor electronic glitches.
Can a clogged air filter cause the fan to run continuously?
Yes, a dirty filter can restrict airflow, causing the system to overwork and keep the fan running.
How much does it cost to replace a furnace fan limit switch?
The cost varies but typically ranges from $50 to $150, including labor.
When should I call a professional for my furnace fan issue?
If troubleshooting doesn’t resolve the issue, or if electrical components need repair, contact an HVAC technician for assistance.
