1、 Heating efficiency fault: slow heating or uneven temperature
1. The heating rate has significantly slowed down and cannot reach the preset temperature
Possible reasons: Scale or oxidation on the surface of the heating tube, leading to a decrease in thermal conductivity efficiency; Dust, fibers, and other debris accumulate inside the air duct, hindering the circulation of hot air; The wind speed of the fan has weakened, making it unable to effectively transport heat; Partial heating elements burned out, resulting in insufficient total heating power.
Solution: For scale buildup, soak the heating tube in a neutral descaling agent for 30 minutes, and then gently clean it with a soft bristled brush (to avoid scratching the insulation layer); Use compressed air to blow debris from the air outlet in the opposite direction, or use a vacuum cleaner to remove it; When the wind speed of the fan is weak, check if the blades are stuck. If the motor makes abnormal noise, replace it with a motor of the same model; The burnt heating tube needs to be replaced to ensure that the power and size of the new tube are consistent with the prototype number.
2. Uneven temperature distribution in the drying room, with localized overheating or undercooling
Possible reasons: Unreasonable air duct design, such as concentrated air outlets on one side, resulting in uneven coverage of hot air; Abnormal fan speed (below rated value), insufficient hot air conveying force; Inconsistent spacing between heating tubes, or some heating tubes not working, resulting in local heat source loss.
Solution: Adjust the angle of the air outlet guide plate, appropriately reduce the air outlet in the overheated area, increase the air outlet in the supercooled area, or add auxiliary air ducts in the supercooled area; If the fan speed is low, replace the fan speed controller to ensure that the speed meets the requirements of the equipment manual; Replace the unused heating tubes according to the above method, and readjust the spacing of the heating tubes to ensure uniform distribution.
2、 Safety related faults: leakage, overheating, or shell overheating
1. The leakage protector frequently trips or the casing is live
Possible reasons: The insulation layer of the heating tube is damaged (the metal tube is exposed), resulting in current leakage; The internal circuit is aging, the outer skin is damaged, and the live wire is in contact with the outer shell; Poor grounding of the equipment prevents leakage current from being directed to the ground.
Solution: Heating tubes with damaged insulation must be replaced immediately and continued use is prohibited; Wrap the damaged circuit with high-temperature resistant insulation tape, and replace the cable directly when it is severely aged (using flame-retardant wire with a cross-sectional area of ≥ 2.5mm ²); When the grounding is poor, re bury the grounding electrode (it is recommended to use galvanized angle steel with a burial depth of ≥ 0.8m) to ensure that the grounding cable is firmly connected to the equipment grounding terminal.
2. Equipment overheating alarm, or shell temperature too high (>60 ℃)
Possible reasons: The temperature controller is malfunctioning, resulting in a large deviation between the displayed temperature and the actual temperature; The thermal overload protection device fails and cannot cut off the power supply in case of overheating; The equipment operates at overload for a long time (such as the drying capacity far exceeding the design capacity), resulting in heat accumulation.
Solution: The malfunctioning thermostat needs to be calibrated (according to the instructions). If there is still a large deviation after calibration, replace the digital thermostat (with an accuracy of ± 0.5 ℃); Replace the failed thermal overload protection module directly to ensure that the model matches the equipment; When operating under overload, reduce the amount of single drying or adjust the operating time (batch drying) to avoid continuous operation of the equipment for more than 8 hours.
3. Smoke and burnt smell in the air duct (precursor to fire)
Possible reasons: Flammable debris (such as fibers and dust) accumulated in the air duct, which was ignited by the high temperature of the heating tube; Heating tube dry burning (power on before starting the fan, no airflow for heat dissipation); Internal circuit short circuit generates electric sparks that ignite debris.
Solution: If there is an open flame, use a dry powder fire extinguisher to extinguish the fire (water is prohibited). After the fire is extinguished, thoroughly clean the debris in the air duct and install a filter screen at the air inlet to prevent debris from entering; Repair the fan to ensure the linkage logic of "the fan starts first, the heating tube is powered on later" (can be implemented by installing a time relay); The short-circuit circuit needs to be replaced and the wiring terminals should be re tightened to avoid poor contact.
3、 Component wear and tear faults: heating tube, fan, shell issues
1. The heating tube does not generate heat, and the equipment does not heat up
Possible reasons: The electric heating wire inside the heating tube is broken (burned out); Loose wiring terminals and poor contact result in the inability to conduct current; The power supply voltage is unstable (more than 10% lower than the rated voltage), and the heating power is insufficient.
Solution: Replace the broken heating tube with a product of the same model, ensure that the wiring terminals are securely fastened during installation, and apply conductive paste to prevent oxidation; Install an automatic voltage regulator (with capacity matching the total power of the equipment) when the voltage is unstable; Loosen the loose terminals with a screwdriver and remove the oxide layer (gently polish with sandpaper).
2. The fan does not rotate or the wind force significantly weakens
Possible cause: Fan motor burnt out (coil broken); The bearing is severely worn, causing the rotor to jam; The blades are entangled with debris and cannot rotate normally.
Solution: When the motor burns out, replace it with a motor of the same speed and power (pay attention to voltage matching, such as single-phase 220V or three-phase 380V); Bearing wear requires disassembly of the fan, replacement of high-temperature resistant bearings (refer to the equipment manual for the model), and application of high-temperature lubricating grease (temperature resistance ≥ 150 ℃); Clean the debris on the blades directly, and check if the blades are deformed after cleaning. If they are deformed, they need to be corrected or replaced.
3. Corrosion and damage to the shell or air duct
Possible reasons: Long term use in environments with high humidity (RH>85%) or acidic or alkaline gases (such as chemical and food processing); The equipment material is ordinary cold-rolled steel without anti-corrosion treatment.
Solution: Mild corrosion (only surface rust): Use sandpaper to remove rust, and then apply two coats of high-temperature resistant anti-corrosion paint (such as epoxy zinc rich paint); Severe damage: Replace the casing or air duct with 304 stainless steel material (316L stainless steel is recommended for highly corrosive environments); At the same time, install dehumidifiers or exhaust fans around the equipment to reduce environmental humidity.
4、Safety reminder: Anti corrosion paint should be completely dried before powering on; Check the corrosion situation once a month to prevent damage from expanding.
1. The temperature displayed by the thermostat has a large deviation from the actual temperature (>± 3 ℃)
Possible reasons: Improper installation position of temperature sensor (close to the heating tube or far away from the hot air circulation area); Sensor damage (such as abnormal resistance of PT100 sensor); The temperature control instrument is not calibrated or the internal components are aging.
Solution: Re fix the sensor to ensure it fits snugly against the inner wall of the air duct; Replace the damaged sensor with a product of the same model (pay attention to the positive and negative terminals of the wiring); Replace the aging temperature control instrument directly, and it is recommended to choose a digital instrument with self calibration function.
2. Automatic protection function failure (no alarm for overheating, no tripping for leakage)
Possible reasons: Damage to protection modules (such as leakage protection modules and over temperature relays); Poor contact of control circuit (loose or detached wiring terminals); Protection parameter setting error (such as setting the over temperature alarm threshold too high).
Solution: Replace the damaged protection module with a product of the same specification; Re plug and tighten the loose wiring terminals; Adjust the incorrect parameters according to the instructions to ensure that the over temperature alarm and leakage protection thresholds meet safety standards.
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Post time: Nov-04-2025
