Haier BD-478A service manual Maintenance Service and Trouble Shooting

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tetra chloromethane or alcohol to clean it. If the leakage occurs in the inner of compressor, it needs to be changed.

(3)Leakage of temperature controller: because of too long a period of service or too high temperature, or too much dirt, or too high humidity, there may be electricity leakage. If it has been defined that there is leakage of temperature controller, please change.

(4)Leakage of starting relay: during mounting and repairing, screw of relay lead is easy to contact the shell and leakage will then occur. If you suspect the relay is bad, check it. If there is leakage, please make the connections again and leave a piece of insulation paper under the screw.

(5)Leakage of fan: because of too high humidity of freezer environment or a bad fan controlling unit, the fan is burned after long time operation and thus causes leakage. Using voltammeter to measure the insulation resistance between each respective connection terminal and the freezer body, if the resistance is too little, means there is leakage caused by humidity; if the resistance

Is zero, means the fan coil is burned or short-circuited. Please change the fan.

MAINTENANCE SERVICE AND TROUBLE SHOOTING

Maintenance Service and Trouble Shooting

12.1.3 Troubleshooting observation

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Contents BD-478A Contents Product Code Illumination and Series Introduction First letter of Freezer in Chinese spellingFeatures FeaturesSpecifications BD-388A BD-478ASafety Precautions Safety Precautions Net Dimension 1420*715*810 1690*715*8101420*715*1470 1690*715*1470 Installation and Accessory Parts ·Proper Air CirculationElectrical Requirement Installation and Accessory Parts Defrosting and Draining The Freezer Food Storage BasketSystem Flow Chart Adjustable temperature dial Function ScheduleMaintenance Service and Trouble Shooting Brief description of principle about BD-318A/428AServicing freezer Reasons of electricity leakage of freezerMaintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Troubleshooting by sounds Troubleshooting by touch System noise repair Poor freezing effect analysis and solutions How to handle the seal bar for poor sealing Why freezer cannot be used at low temperature environment How to know there is problem with compressor MotorPage Page Procedure for fan change Procedure for temperature controller changeCommon freezer problems Operation of freezer is not normal Service procedure Repair equipment RequirementsEvacuation and fill machine is special only for R134a use Changing procedure of R134a compressor Compressor installation and brazing procedures Application and maintenance of freezer Product charactersPage Safety notice of product MaintenanceStandard procedure of maintenance 12.5 Freezer repair tool and equipment It is not allowed to fill R134a by R12 filling equipmentProcedure for filling equipment ⑧ Switch off motorFreezer noise sources CompressorFilling Resonance sound of compressor components How is the sound of water flowing generated? Gas flowing soundWhy the freezer’s noise increases after using Why freezer noise changes greater at night? Why freezer’s noise increases after stop use for sometime?How to reduce freezer’s noise? Sometime?Why freezer noise measured at home is incorrect? What are the national stipulations for freezer Noise?Page Why the noises of it type freezers are different? AnswerHow to determine that the sound is noise or Normal? Noise test There are stipulations in Items 6.5.7.1 and 6.3.6.1.of GB/TMaintenance Service and Trouble Shooting 12.8Measuring technology of freezer performance parameter Temperature with load Test method and instrumentGround resistor Maintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Maintenance Service and Trouble Shooting Exploded View List of Parts QTY BD-388A/478A 392% 600% Lamp switch BD-388A/478A 010% 020%