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Midea HD-668FWEN Service Manual
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Midea HD-668FWEN Service Manual

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Service Manual_2024-V1.0
Service Manual
TMF No Frost Series
Applicable Models
Product Models
Applicable Models
22031020010241
HD-668FWEN
UR-BCD512WE-SQ
The picture in this service manual is only for reference, and specific
appearance and configuration are subject to the real product.
This manual mainly teaches the method, the specific work skill needs
engineer to accumulate through the daily work.
1

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Summary of Contents for Midea HD-668FWEN

  • Page 1 Applicable Models Product Models Applicable Models 22031020010241 HD-668FWEN UR-BCD512WE-SQ The picture in this service manual is only for reference, and specific appearance and configuration are subject to the real product. This manual mainly teaches the method, the specific work skill needs...
  • Page 2 Manufacturers or distributors are not responsible for the content of the Manual and interpretation thereof. Midea Refrigerators Technical Maintenance Manual Copyright @2017 All rights reserved. Replication of all or part of the Manual in any forms shall not be allowed without written approval by the Overseas Sales Corporation of Midea Refrigerators.
  • Page 3 Service Manual_2024-V1.0 Contents SIGNIFICANT UPDATE NOTES (NONE) ......................5 2. SAFETY WARNING ............................... 6 2.1 W ARNING FOR OPERATION SAFETY ........................... 6 2.2 S AFETY INSTRUCTION FOR REFRIGERANT ......................... 8 3. INSTALLATION AND COMMISSIONING ......................9 3.1 H ................................... 9 ANDLING 3.2 D ISASSEMBLY AND...
  • Page 4 Service Manual_2024-V1.0 7.12 I CE MAKER ................................34 8. TEMPERATURE SENSING SYSTEM ......................... 35 8.1 P ............................35 OSITION OF SENSORS 8.2 R ........................... 35 EPLACEMENT OF SENSORS 8.3 S ENSOR WITHOUT TERMINAL REPLACEMENT ......................36 8.4 S ..............................37 ENSOR TABLE 9.
  • Page 5 Service Manual_2024-V1.0 1. Significant update notes (None)
  • Page 6 Service Manual_2024-V1.0 2. Safety Warning 2.1 Warning for operation safety Important Safety Instructions CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol indicates that dangerous voltage constituting a risk of electric shock is present within your freezer. This symbol indicates that there are important operating and maintenance instructions in the literature accompanying your freezer.
  • Page 7 Service Manual_2024-V1.0 CONNECTING ELECTRICITY Electrical Shock Failure to follow these instructions Hazard. can result in death, fire, or electrical Plug into a grounded 3-prong outlet. shock. Do not remove the ground prong. Do not use an adapter. WARNING Electric Shock Hazard Failure to follow these instructions can result in electric shock, fire, or death.
  • Page 8 Service Manual_2024-V1.0 guidelines of federal law must be removed before disposal. It is the consumer's responsibility to comply with federal and local regulations when disposing of this product. 12) This freezer is intended to be used in household and similar environments. 13) Do not store or use gasoline or any flammable liquids inside or in the vicinity of this freezer.
  • Page 9 Service Manual_2024-V1.0 3. Installation and commissioning 3.1 Handling Handling Protect the refrigerator in moving it,Same as shown as left photo, please move it by handcart with cushion Remove all packing materials and bottom cushion, the move into house for placement After moving it to appropriate location, wait for 2 hou rs before power on.
  • Page 10 Service Manual_2024-V1.0 3.4 Leveling of the refrigerator Leveling of the refrigerator If the refrigerator cannot be placed steadily, adjust the footing to level it. Turn the feet clockwise to raise the refrigerator; turn the feet counterclockwise to lower the refrigerator. 3.5 Left or right open door reversal Door reversal Power off and remove all food from the fridge.
  • Page 11 Service Manual_2024-V1.0 5) Remove the bottom hinge and screws. 6) Unscrew the hinge shaft from the right side of the bottom hinge and move it to the left side, then secure the bottom hinge to the bottom left side of the refrigerator.
  • Page 12 Service Manual_2024-V1.0 8) Dismantle the screws and door stopper on the refrigerator door, and assemble them on the other side. Dismantle the sleeves on the freezer door, and assemble them on the other side. 9）Remove the freezer door self-locking block and stopper, save them to reuse.
  • Page 13 Service Manual_2024-V1.0 11) Put down the freezer door on the middle hinge, then take out the top hinge and cover of other side from the accessory plastic bag. Then assemble the left top hinge, hinge cover and hole cover. 3.6 Installation of handle（Option） Installation of handle 1) Remove the hole covers on the front of the door.
  • Page 14 Service Manual_2024-V1.0 4. Main parts and external dimension 4.1 Main parts (The picture is only for reference, and specific appearance and configuration are subject to the real product)
  • Page 15 1275 (The picture is only for reference 4.3 Midea product serial number and location 1） Product Serial Number — Including order number, production date and other information. When the product occur problem, it needs to be recorded or photographed and provided to us.
  • Page 16 Service Manual_2024-V1.0 2）Paste location Some products also have S/N on the lower part of the right side of the Cabinet.
  • Page 17 Service Manual_2024-V1.0 5. Electric control system 5.1 Electrical parts parameters Applicable Model HD-668FWEN Product Model UR-BCD512WE-SQ Rated Voltage 115V、60Hz Item Specification Refrigerant R600a Compressor EZ65H1X Starting device type Fixed Speed The COP of compressor 1.86(W/W) The max cooling capacity of compressor...
  • Page 18 Service Manual_2024-V1.0 5.2 Circuit diagram FD: Freezer defrost R: Refrigerator A: Ambient temperature...
  • Page 19 Service Manual_2024-V1.0 5.3 Main PCB terminal connection diagram Connecting terminals Connecting terminals Refrigeration lamp Ambient temperature sensor Freezing fan motor Display control panel Freezing defrost sensor Refrigeration door switch None 10. Freezing frost heater Refrigeration sensor 11. Compressor None 12. Power...
  • Page 20 Service Manual_2024-V1.0 6. Refrigeration system 6.1 Refrigeration system working principle ❶Compressor→❷ Anti-condensation tube→❸ Condenser→❹ Dry filter→❺ Capillary tube→❻ Evaporator→❼ Suction tube→❶Compressor 6.2 Cooling pipeline and drain pipe inside the cabinet...
  • Page 21 Service Manual_2024-V1.0 6.3 Circulating route of cooling air 6.4 Welding points in chambers or foam layer 1) Welding points on freezer evaporator Welding point Pipe outer diameter (mm) 1-Freezer capillary and inlet of evaporator Aluminum pipe: Copper pipe: Φ6 Φ6.0 2-Heat transition tube and outlet of evaporator Aluminum pipe: Copper pipe: Φ6...
  • Page 22 Service Manual_2024-V1.0 6.5 Welding point in the compressor case Welding point Pipe outer diameter (mm) 1-Inlet of anti-condensation tube and outlet of venting Steel pipe: Φ4.0 Steel pipe: Φ4.0 connection tube 2-Inlet of condenser tube and outlet of anti-condensation Steel pipe: Φ4.0 Steel pipe: Φ4.0 tube Steel pipe: Φ4.
  • Page 23 Service Manual_2024-V1.0 7. Dismantling of parts 7.1 Parts on the door Door seal Door seal is installed into door liner groove. 1)Open the refrigerator door; 2)Take the door seal out of door liner; Door tray While squeezing it inward, lift up the door tray and take it out from door liner.
  • Page 24 Service Manual_2024-V1.0 7.2 Parts inside the refrigerator Refrigerator Fruit box cover Remove the crisper cover of ref. compartement accordin g to below steps: 1） 1）Take out the crisper firstly. 2） Lift up the Fruit box cover, and then pull out it. Shelves Lift up the division plate with a proper force and pull it out towards yourself;...
  • Page 25 Service Manual_2024-V1.0 2）Remove the light. 3) The reverse process can complete installation. Light switch There is a light switch on the side wall of the refrigerating chamber. 1）Loosen the hook with small normal screwdriver and pull out the switch until the wire connector reveals. 7.4 Air duct components refrigerating chamber and electric damper Air duct components in freezing chamber 1）...
  • Page 26 Service Manual_2024-V1.0 3）use fingers to hold the button edge of air duct cover and pull it outwards with big strength Electric damper None 7.5 Air duct components in freezing chamber and fan motor Air duct components in freezing chamber All accessories in the freezing chamber should be dismantled before removing the air duct components.
  • Page 27 Service Manual_2024-V1.0 4)Take out the freezing air duct assembly. Fan motor of air duct Pull buckles at the back of the freezing air duct and remove 2 front cover plates 1） Replace the fan in reverse steps; 7.6 Evaporator and Defrost system Evaporator in freezing chamber 1）Remove the air duct components in freezing and variable temperature chamber.
  • Page 28 Service Manual_2024-V1.0 Evaporator in refrigerating chamber None 7.7 Compressor case Rear cover None Piping and parts in the compressor case 1-Power cord 4-Drain tray 1 2-Dry filter 5-Suction connection tube 3-Compressor 6-Drain tray 2 Disassembly and assembly of compressor 1）Cut off the power, remove the goods in the refrigerator, with the tape to make the door fixed firmly and prevent the door dropping when the refrigerator dumping.
  • Page 29 Service Manual_2024-V1.0 2）Slowly tilt the refrigerator forward, relying on the wall or a solid enough object, leaving space to facilitate the operation. For safety, it should be carried by someone to prevent its falling. 3）Cut off the compressor pipeline.-❶Cut off the process pipeline.-❷Cut off the low-pressure muffler.- ❸Cut off the high-pressure exhaust pipe.
  • Page 30 Service Manual_2024-V1.0 6）Remove the protective cover -Pry the protective cover slowly from the upper part, -Pull it out and remove it. 7）Remove the starter and protector Unplug the starter and protector (you can use a screwdriver to pry it slowly) 8）Loosen the screw of the compressor bottom plate, remove the floor together with the compressor from the box.
  • Page 31 Service Manual_2024-V1.0 10）Use Pipe cutter cut off the condenser tube❽, then Shear off capillary ❾ by the capillary tube scissors. 11）Replace the compressor and welding the compressor pipeline.-❿Welding the process pipeline.- ⓫Welding the low-pressure muffler.-⓬Welding the high-pressure exhaust pipe. 12）Replace the filter, Cu-Fe tubes welding ⓭ used Ag welding rod, Cu-Cu tubes welding ⓮...
  • Page 32 Service Manual_2024-V1.0 14）Perfusion refrigerant. 15）Use the vise grip pliers clamp the middle of the process pipe, then seal welding process tube⓯⓰. 7.8 Display control board Display control board Use slotted screwdriver to pry up the display control panel assembly; Disconnect the wiring connector, take out the display control panel assembly;...
  • Page 33 Service Manual_2024-V1.0 3）Remove the 2 pcs fitting screws of display PCB, the display PCB can be dismantle for replacement; 7.9 Main control board 1) Remove the two screws that secure the main control board box. 2) Take out the mounting box, pry up the cover, disconnect the wiring terminal.
  • Page 34 Service Manual_2024-V1.0 5）Disconnect the wiring terminal, take out the main control board, and complete the replacement. 7.10 Inverter driver board（None） 7.11 Water dispenser（None） 7.12 Ice maker Please buy the IM1900MD type ice machine specified by the seller. The ice maker can be installed by the customer.
  • Page 35 Service Manual_2024-V1.0 8. Temperature sensing system 8.1 Position of sensors Position of sensors Have 3 sensors ② Sensor in refrigerating chamber ④ Ambient temperature sensor ⑦ Defrost sensor in freezing chamber 8.2 Replacement of sensors Sensor in refrigerating chamber The refrigerating air duct components should be dismantled before removing this sensor.
  • Page 36 Service Manual_2024-V1.0 Ambient temperature sensor The sensor is located in the hinge cover of the refrigerator top. Defrost sensor in freezing chamber 1） Cut off wiring terminal; 2） Cut off the band which fixes the sensor; 8.3 Sensor without terminal replacement Sensor replacement guidelines Cut off the damaged head of sensor.
  • Page 37 Take out a new sensor to cut the head of sensor. (Spare parts code：11201007000795) Its technical specifications apply to all MIDEA refrigerators. Strip off the head of the sensor and connect it. Wrap the two wires together with insulation tape.
  • Page 38 Service Manual_2024-V1.0 3.20 15.12 48.20 4.167 93.20 1.368 5.00 14.310 50.00 3.972 95.00 1.312 6.80 13.550 51.80 3.788 96.80 1.259 8.60 12.830 53.60 3.613 98.60 1.209 10.40 12.160 55.40 3.447 100.40 1.161 12.20 11.520 57.20 3.290 102.20 1.115 14.00 10.920 59.00 3.141 104.00...
  • Page 39 Service Manual_2024-V1.0 9. Function and operation 9.1 Display operation panel Refrigeration chamber temperature control panel Button Icons A. Refrigerating chamber temperature gear setting ① Super cool (LED1) ② Coldest (LED2) ③ ● (LED3) ④ Cold (LED4) 9.2 Temperature control 9.2.1 Temperature setting of refrigerating chamber Press the Freezing or Refrigerating chamber gear setting button once, the gear will be changed once, 15 seconds after setting the gear, the refrigerator will be running in accordance with the set value.
  • Page 40 Service Manual_2024-V1.0 9.2.2 Temperature setting of freezing chamber The temperature inside the freezer can be adjusted by changing the position of the damper slider. The initial position of the damper slider is at position A. If lower temperature inside the freezer is required, you can adjust the damper slider from the position A to left side.
  • Page 41 Service Manual_2024-V1.0 9.5 Open door alarm (None) 9.6 Error code and solutions Fault Type Troubleshooting and Solutions Error code Refrigerator chamber Step 1: Check whether the connection terminals are LED① and LED② sensor failure (E1) together lighten plugged in place and whether there are foreign matters in them;...
  • Page 42 Service Manual_2024-V1.0 In forced defrosting mode, if the then the refrigerator will exit the test defrosting heater has been working mode and return to normal operation for 60 minutes, mode Enter into test mode and press All lights are off, then the refrigerator Select to exit will exit test mode and return to normal the test mode...
  • Page 43 Service Manual_2024-V1.0 10. Compressor 10.1 Compressor on and off control specifications 1.1 When one of the following conditions is met, the compressor stops: 1) Measured temperature in Refrigerator chamber ≤ Shutdown temperature of Refrigerator chamber 2) Enter defrosting cycle 3) The compressor runs continuously for more than 6 hours, will stop at least 10 minutes 1.2 When compressor shutdown time has been more than 10 min, one of the following conditions is met, the compressor starts up: 1) Measured temperature in Refrigerator chamber ≥...
  • Page 44 Service Manual_2024-V1.0 11. Troubleshooting Method 11.1 No cooling (Air cooling-Electronic)
  • Page 45 Service Manual_2024-V1.0...
  • Page 46 Service Manual_2024-V1.0 11.2 No working of compressor...
  • Page 47 Service Manual_2024-V1.0 11.3 Inside frosting, no defrosting...
  • Page 48 Service Manual_2024-V1.0 11.4 Inside frosting, no defrosting-Maintenance guidelines...
  • Page 49 Service Manual_2024-V1.0 11.5 Light is not on...
  • Page 50 Service Manual_2024-V1.0 11.6 Fan failure 11.7 Defective defrost circuit...
  • Page 51 Service Manual_2024-V1.0 11.8 Noise 11.9 Air duct not operated...
  • Page 52 Service Manual_2024-V1.0 12. Product exploded view and spare parts list Please log in to TSP system to view and download these contents.
  • Page 53 For more information about where you can drop off your waste for recycling, please contact your local authority, or where you purchased your product. Midea Refrigerators If you need to get detailed technical information from the manufacturer, please contact: xxx@midea.com...

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