Troubleshooting Common Issues with Industrial Furnace Heaters


Industrial furnace heaters play a critical role in various manufacturing processes, ensuring optimal temperature conditions for production. However, like any machinery, they can encounter issues that disrupt operations and affect efficiency. In this comprehensive guide, we’ll delve into the common problems faced with bundle rod heaters, bobbin heaters, edge wound heaters, open coil heaters, and radiant tubes along with practical troubleshooting solutions.

By understanding these issues and their solutions, you can ensure the optimal functioning of your furnace heaters, minimize downtime, and maximize operational efficiency. Marathon Heater (I) Pvt. Ltd. manufactures and offers furnace heaters including bundle rod, bobbin, infrared radiant heaters, edge wound, radiant tubes and open coil heaters.

Bundle Rod Heaters:

Bundle rod heaters are widely used for their versatility and efficiency. However, they may face certain issues such as uneven heating, overheating, or failure to reach desired temperatures. Here’s how to troubleshoot:

  • Uneven Heating: Check for damaged or worn-out rods and replace them if necessary. Ensure proper alignment and spacing between rods to distribute heat evenly.
  • Overheating: Inspect the insulation and ventilation system. Poor insulation or inadequate airflow can lead to overheating. Clean or replace air filters and ensure proper insulation to regulate temperature effectively.
  • Failure to Reach Desired Temperatures: Verify the power input and electrical connections. Inadequate power supply or faulty connections can hinder the heating process. Check for loose connections, damaged wiring, or circuit breakers and rectify them accordingly.

Bobbin Heaters:

Bobbin heaters are renowned for their durability and reliability. However, they may encounter issues such as corrosion, element failure, or insufficient heating. Here’s how to troubleshoot:

  • Corrosion: Inspect the heating elements and the surrounding environment for signs of corrosion. Replace corroded parts and implement corrosion-resistant coatings to prolong heater lifespan.
  • Element Failure: Test the continuity of the heating elements using a multimeter. Replace any faulty elements to restore functionality.
  • Insufficient Heating: Ensure proper voltage supply and adequate insulation. Low voltage or poor insulation can result in insufficient heating. Verify the voltage levels and inspect the insulation for any damages or gaps.

Edge Wound Heaters:

Edge wound heaters are preferred for their high power density and uniform heating. However, they may face issues like hot spots, element degradation, or mechanical damage. Here’s how to troubleshoot:

  • Hot Spots: Inspect the heater surface for localized hot spots. Uneven winding or insulation degradation can cause hot spots. Realign the winding or replace damaged insulation to eliminate hot spots.
  • Element Degradation: Monitor the resistance of the heating element over time. An increase in resistance indicates element degradation. Replace worn-out elements promptly to prevent performance degradation.
  • Mechanical Damage: Check for any physical damage to the heater coils or housing. Mechanical stress or impact can compromise heater integrity. Reinforce or replace damaged components as necessary.

Open Coil Heaters:

Open coil heaters are commonly used for high-temperature applications. Issues such as coil oxidation, airflow blockage, or power fluctuations can affect performance. Here’s how to troubleshoot:

  • Coil Oxidation: Inspect the coils for signs of oxidation or corrosion. Implement protective coatings or use corrosion-resistant materials to mitigate oxidation.
  • Airflow Blockage: Clean or replace air filters regularly to maintain proper airflow. Blockages can cause overheating and reduce heater efficiency.
  • Power Fluctuations: Install voltage regulators or surge protectors to stabilize the power supply. Fluctuations in voltage can damage heating elements and affect performance.

Radiant Tubes:

Radiant tubes are renowned for their energy efficiency and uniform heating. However, they may encounter issues such as combustion problems, ignition failures, or uneven heating. Here’s how to troubleshoot:

  • Combustion Problems: Inspect the burner assembly for clogs or misalignments. Clean or realign the burners to ensure proper combustion.
  • Ignition Failures: Check the ignition system for defects or malfunctions. Replace faulty ignition components and verify the proper fuel supply for ignition.
  • Uneven Heating: Evaluate the tube layout and burner positioning. Adjust the burner settings or tube configuration to achieve uniform heating across the furnace.

Control System Malfunctions:

Malfunctioning control systems can disrupt furnace heater operations and lead to various issues. Common control system problems include faulty temperature sensors, inaccurate set points, or improper programming. Regularly inspecting and calibrating temperature sensors, verifying set points, and updating control system programming can help rectify these malfunctions and optimize furnace performance.


Overheating is a serious issue that can pose safety risks and potentially damage the industrial furnace heater. Causes of overheating include a malfunctioning thermostat, a blocked exhaust system, or restricted airflow due to dirty or clogged filters. To address this problem, check the thermostat settings and ensure they are accurate. Regularly clean or replace air filters to maintain proper airflow and prevent overheating.


Troubleshooting common issues with industrial furnace heaters requires a systematic approach and a thorough understanding of the equipment. By identifying and addressing potential problems promptly, you can ensure optimal performance, prolong equipment lifespan, and minimize downtime in manufacturing operations. Implementing proactive maintenance measures and adhering to best practices can further enhance the reliability and efficiency of industrial furnace heaters.

Marathon Heater (I) Pvt. Ltd. is a furnace heater manufacturer and offers furnace heaters including bundle rod heater, edge wound heater, bobbin heater and radiant tubes.

Contact us at for your requirements for any industrial heater.