The common problems in the use of air duct heaters mainly focus on four aspects: electrical safety, heating efficiency, mechanical structure, and operation and maintenance.
1. Electrical safety and control system issues
Burning of electric heating tube: This is the most common problem. Usually caused by dry burning (due to the fan not starting or insufficient air volume, heat cannot be carried away), high voltage, or severe scaling on the surface of the electric heating tube. Burning it will cause the heater to malfunction or leak electricity.
Failure of temperature control system: Damage or improper positioning of temperature sensors (such as thermocouples) can result in inaccurate temperature measurement, causing overheating tripping or temperature not reaching the set value. The burning of contactors and relay contacts inside the control cabinet can also cause control failure.
Leakage/short circuit: The insulation layer of the electric heating tube is aging and damaged, and the wiring terminals are damp or loose, which may cause leakage or short circuit and trigger the action of the leakage protector.
2. Heating performance and efficiency issues
Decreased heating efficiency: After long-term use, dust, oil, or scale will adhere to the surface of the electric heating tube, forming an insulation layer that prevents effective heat transfer to the air, resulting in increased energy consumption but lower air outlet temperature.
Uneven outlet temperature: Unreasonable duct design or high/low wind speed may result in uneven airflow distribution, overheating in some areas and insufficient temperature in others.
3. Mechanical structure and installation issues
Duct deformation or air leakage: Heat loss and energy waste are caused by high temperature deformation or poor sealing at the heater casing or flange connection.
Vibration and noise: Improper matching of the fan and heater, or loose fixing brackets, can cause significant vibration and noise during operation.
4. Operation and maintenance issues
Mistake operation: The most common mistake is to turn on the heating before turning on the fan, or to turn off the heating before turning off the fan when shutting down. Both of these operations can cause the electric heating tube to instantly dry burn, making it highly susceptible to damage.
Improper maintenance: Lack of regular cleaning, resulting in poor heat dissipation; Failure to regularly inspect fasteners and insulation resistance may pose safety hazards.
Usage recommendations
Strictly follow the start stop sequence: when starting, "turn on the fan first, then turn on the heating"; When stopping, turn off the heating first and wait for the air duct to cool down before turning off the fan.
Regular cleaning: According to the usage environment (such as high dust and humidity), regularly clean the dust and dirt on the surface of the electric heating tube to maintain good heat dissipation.
Regular inspection: Check if the wiring terminals are loose, measure the insulation resistance of the electric heating tube (usually requiring>1M Ω), and ensure that the temperature control instruments and sensors are working properly.
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Post time: Mar-19-2026
