| Failure phenomenon | Possible causes | Handling method | Reference |
| The temperature controller displays a negative value or a smaller value | The positive end of the sensor is not connected correctly | Just change it and the display will return to normal | |
| ※The temperature controller displays an abnormal value | The specification of the input sensor for the parameters of the temperature controller changes (intelligent instrument | Check the parameters according to the operating manual of the temperature controller. If not correct, modify the value to the corresponding sensor | |
| The sensor is disconnected or damaged | Replace the sensor with one of the same specification (or contact our company) | Replace the corresponding components according to the electrical schematic diagram | |
| ※The control circuit has no power supply and all operations are invalid | The fuse of the control circuit is blown | Replace the fuse with one of the same specification (or contact our company) | Replace the corresponding components according to the electrical schematic diagram |
| The power switch fails; the power button is damaged; or the power intermediate contactor is damaged | Replace the switch, button, or intermediate contactor | ||
| ※There is little or no air circulation in the oven | Check whether the rotation direction of the blower motor is correct | Correct the rotation direction of the motor, and exchange any two phases of the power incoming line | Ditto |
| Check whether the incoming power line has three-phases (lack of phase, etc.) | Connect the power supply properly | ||
| Check whether the blower fuse is blown or whether the air switch is engaged or damaged | Replace the fuse, engage the air switch or replace | Ditto | |
| Check whether the contactor and thermal relay controlling the blower are damaged | Replace damaged components | ||
| ※Heating stops after a while | Check whether the temperature of the main temperature controller and the display temperature controller is set properly | Set the required temperature | |
| If the blower does not operate either, it is possibly caused by the action of the thermal relay of one of the motors | In case of three-phase imbalance of the motor, change the thermal relay to one without phase failure protection, or increase the action setting current (while the motor is not hot) | Ditto | |
| ※Display of or measurement by an ammeter shows that the currents of three phases vary greatly and are unbalanced | The heating fuse is blown | Replace the fuse with one of the same specification | Ditto |
| One or more heating tubes may be damaged | Replace the fuse with one of the same specification | ||
| ※Heating alarm occurs frequently | Check whether the alarm temperature set for each instrument is too small | Increase the alarm temperature (generally not exceeding the temperature of the main controller by more than 50 degrees) | |
| The sensor is sometimes good and sometimes bad | Measure the resistance of the sensor. Replace if it is damaged | ||
| Heating is interrupted; the heating indicator flashes and the heating temperature does not go up (intelligent control is provided) | The parameters controlling output mode inside the intelligent temperature controller change | Modify parameters that control the output mode | User’s manual of the instrument |
| The solid state is not triggered, possibly because the instrument output is disconnected or the solid state is damaged | The solid state is not triggered, possibly because the instrument output is disconnected or the solid state is damaged | Replace corresponding components according to the electrical schematic diagram | |
| Check whether there is voltage output from the regulated power supply | Repair or replace the regulated power supply | ||
| One group of the heating tubes is not working, possibly due to the action or damage of the temperature sensitive switch | Check whether the radiator is hot, and whether the cooling fan is working, or replace them | ||
| ※Heating is out of control | The main controller is damaged | Change the main controller | Ditto |
| The contactor is damaged (the contact is burnt and melted, or solid state is breakdown) | Replace elements | ||
| Check whether the motor can rotate, possibly because the button may not work or the contactor may be damaged | Replace failed components | ||
| The exhauster does not work properly (not available for standard models) | The time relay or the transfer switch thermal relay fails or the air switch trips (the fuse is blown) | Replace failed components or engage the air switch | Ditto |
| ※The blower stops automatically after running for a period of time, and cannot be turned on again. It can only be opened after a long time | There may be motor overcurrent, and the corresponding thermal relay conducts protection action | Increase the setting current of the thermal relay, and press the reset button once. If it is burnt out, replace it | Refer to the electrical schematic diagram and component list |
| Air leakage is found from the door or explosion-proof window | The asbestos rope is loose or uneven | Arrange or replace the asbestos rope |
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