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Commercial refrigeration failure self-diagnosis results and troubleshooting
commercial refrigeration failure self-diagnosis results and troubleshooting
(1) The LED lights on the commercial refrigeration display board are all off. Open the refrigerator door, observe that the lights are off, and check the power supply circuit. The failure rate of transformer, insurance, and varistor is high. Check whether the connection between the display board and the main control board is good.
(2) Pressing the function buttons on the display panel has no response. Check the indicator lights, and press the freezing compartment temperature setting button and the quick-freezing button at the same time. At this time, the display panels should all be on, otherwise the indicator lights should be checked. In addition, check whether the display board is well assembled, and whether the touch switch of the printed circuit board (printed board) is pressed when the button is pressed, otherwise it should be reassembled.
(3) Poor defrosting or no defrosting Check the heating condition of the defrosting heater: Press the test button of the main control board twice continuously, and the heater still does not heat, it means that there is a fault. Firstly, check whether the test temperature fuse is disconnected; secondly, check whether the defrost sensor is abnormal (Note: when the temperature of the defrost sensor is above 13°C, it will return to the initial state); in addition, check whether the drain pipe is blocked or if it is blocked , The blockage should be cleared in time; if there is more residual frost on the surface of the evaporator, check the attachment of the defrost sensor and the sealing performance of the freezer door.
(4) The temperature in the freezer is too high. Check whether the fan motor works abnormally. Press the test button of the main control board, the fan motor should start to work immediately: if it does not start, check whether the fan motor itself and the related wires are in good contact. Check whether the commercial refrigeration defrosting is normal. If the frost layer on the surface of the evaporator is thick, the temperature in the freezer will be higher. First check according to the steps of poor defrosting, and then check the temperature sensor in the freezer, whether the installation position is shifted, and use a meter to measure whether the resistance of the sensor is normal. The relationship between the normal resistance of the freezer compartment temperature sensor and the defrost sensor and the ambient temperature.
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