Midea Compact Series Refrigerator Service Manual

Safety Information

Midea Refrigerators Technical Maintenance Manual

Copyright @2017. All rights reserved. Replication without written approval from Overseas Sales Corporation of Midea Refrigerators is prohibited.

2. Safety Warning Code

2.1 Warning for Operation Safety

WARNING:

1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use appliance near water.
6. Clean only with a damp cloth.
7. Do not block ventilation openings.
8. Install according to manufacturer's instructions.
9. Do not install near heat sources (radiators, heat registers, stoves).
10. Do not defeat polarized or grounding-type plug safety. A polarized plug has one wider blade; a grounding plug has two blades and a third grounding prong. Consult an electrician if the plug does not fit the outlet.
11. Protect power cord from being walked on or pinched, especially at plugs, receptacles, and exit points.
12. Do not attempt to modify or extend the power cord.
13. Unplug during lightning storms or when not used for long periods.
14. Ensure available AC power matches voltage requirements.

Connecting Electricity

[Warning Symbol] Electrical Shock Hazard. Plug into a grounded 3-prong outlet. Do not remove the ground prong. Do not use an adapter. Failure to follow these instructions can result in death, fire, or electrical shock.

[Warning Symbol] Electric Shock Hazard Failure to follow these instructions can result in electric shock, fire, or death.

1. WARNING Keep ventilation openings clear of obstruction.
2. WARNING Do not touch the interior with wet hands; this could result in frost bite.
3. WARNING Do not use mechanical devices or other means to accelerate defrosting, other than manufacturer-recommended methods.
4. WARNING Do not damage the refrigerant circuit.
5. WARNING Do not damage refrigerant tubing when handling, moving, or using the freezer.
6. WARNING-DANGER Never allow children to play with, operate, or crawl inside the freezer due to risk of child entrapment. Before discarding an old freezer: 6-1) Take off the doors. 6-2) Leave shelves in place to prevent climbing.
7. Unplug the freezer before performing user maintenance.
8. This freezer can be used by children aged eight years and older and persons with reduced physical/mental capabilities or lack of experience/knowledge, if given supervision or instruction and they understand hazards. Children should not play with the freezer. Cleaning and maintenance should not be performed by children without supervision.
9. If a component part is damaged, it must be replaced by the manufacturer, its service agent, or similar qualified persons to avoid a hazard.
10. Dispose of the freezer according to local regulations as it contains flammable gas and refrigerant. Follow federal and local regulations for disposal.
11. This freezer is intended for household and similar environments.
12. Do not store or use gasoline or flammable liquids inside or near the freezer.
13. Do not use extension cords or ungrounded (two-prong) adapters. If the power cord is too short, have a qualified electrician install an outlet. Extension cords can negatively affect performance.

Grounding Requirement

The freezer must be grounded. It is equipped with a cord having a grounding wire and plug. The plug must be inserted into a properly installed and grounded outlet. Improper use of the grounding plug can result in electric shock. Consult a qualified electrician or service person if grounding instructions are unclear.

2.2 Safety Instruction for Refrigerant

3. Transport

3.1 Handling

Handling:

1. Protect the refrigerator during moving. As shown in the left photo, move it by handcart with a cushion.
2. Remove all packing materials and bottom cushion before moving into the house for placement.
3. After moving to the appropriate location, wait for 2 hours before powering on.

Diagram shows a person moving a refrigerator on a handcart with a cushion.

4. Installation and Commissioning

4.1 Door Disassembly and Assembly

The refrigerator door may need to be dismantled if it cannot enter the room as a whole unit.

4.2 Installation Location

Installation location: Choose a location that is easy for ventilation to facilitate heat dissipation, enhance performance, and reduce energy consumption.

Diagram shows a refrigerator with recommended clearances: 100mm on sides, 300mm at the back, and 100mm at the top.

4.3 Leveling of the Refrigerator

Leveling of the refrigerator: If the refrigerator cannot be placed steadily, adjust the footing to level it.

Diagram shows two views of the refrigerator base. One shows the refrigerator tilted with a cross mark [X] indicating it's not level. The other shows the refrigerator level with a checkmark [✓] indicating it is properly leveled, with an illustration of adjusting a leveling foot.

4.4 Left or Right Open Door Reversal

Door reversal: Instructions for door reversal are provided.

Diagrams illustrate the process of dismantling and reassembling the door hinges for reversal. This involves removing the upper hinge cover and screws, then the door and bottom hinge assembly, and reassembling on the opposite side. It also shows removing plastic screw hole caps.

4.5 Installation of Handle (None)

4.6 Installation of Door Lock (None)

5. Product Configuration and Dimension

5.1 Main Parts and Their Names

Diagram shows the interior of the refrigerator with labels pointing to: Temperature-control knob, Shelf (multiple), Toolbar (multiple), Zip-top can steel bar, and Levelling foot. A note indicates the picture is for reference only.

5.2 External Dimension

Diagram illustrates the dimensions A through H on an outline of the refrigerator and its door opening.

5.3 Location of S/N

Diagram shows the Serial Number (S/N: XXX) located on the Carton Box (at positions 1 and 2) and on the Product itself (at position 3, near the COMP unit). It notes that some products also have the S/N on the lower right side of the cabinet.

6. Product Specification

6.1 Electrical Parameters

6.2 Cooling Temperature Setting Range

6.3 Circuit Diagram

Diagram illustrates the electrical circuit including: Power Plug (G, L, N), Thermostat, E-Light Switch, Lamp, Overload Protector, Compressor, PTC, and Capacitor.

7. Refrigerating Piping System and Circulating Route of Cooling Air

7.1 Refrigerating Piping System

The system consists of the following components:

• 1 Compressor
• 2 Condenser
• 3 Dry filter
• 4 Capillary tube
• 5 Evaporator
• 6 Suction tube

Diagram shows a closed loop representing the refrigeration cycle with numbered components: Compressor (1), Condenser (2), Dry filter (3), Capillary tube (4), Evaporator (5), and Suction tube (6), with arrows indicating refrigerant flow.

8. Dismantling of Parts

8.1 Parts on the Door

Door Seal

It is more convenient to pull out from the corner. Take the door seal out of the door liner. When reloading, the door must be installed into the tank, carefully pressed flat, and checked for gaps between the door seal and the box body.

Diagram shows how to remove the door seal from the refrigerator liner.

Guardrail

Grab the Guardrail and squeeze it sideways to pull out and remove it from the refrigerator.

Diagram shows a refrigerator interior with labels for Toolbar and Zip-top can steel bar, and illustrates how to remove the guardrail.

8.2 Parts Inside the Refrigerator

Shelf Assembly of Refrigerator

Used to place vegetables, fruits, and other items. Lift the division plate with proper force and pull it out towards yourself.

Diagram shows a refrigerator interior and illustrates lifting and pulling out a shelf.

Freezer Drawer

None

8.3 Light System

Light of the Refrigerating Chamber

The light is located at the right of the refrigerator chamber. Steps to remove:

1. Remove the light cover.
2. Loosen the thermostat knob and fastening screw, and remove the thermostat box assembly.
3. Remove the connector.
4. Remove the light.

Three images show the steps: removing the light cover, loosening the thermostat knob and screw, and removing the connector.

Light of the Freezing

None

Light Switch

There is a light switch on the side wall of the refrigerating chamber. Loosen the hook with a small normal screwdriver and pull out the switch until the wire connector is revealed.

Diagram shows the location of the light switch and how to pull it out.

8.4 Evaporator and Defrost System (None)

8.5 Compressor Case

Rear Cover and Compressor Case

None

Compressor and the cooling system pipe: None

Diagram shows the piping system in the compressor case, labeling: 1 Dry filter, 2 Suction transition tube, 3 Compressor, 4 Right condenser. An image shows these components with red arrows indicating their positions.

Drain Tray

Diagram shows the drain tray.

8.6 Display Control Board (None)

8. Dismantling of Parts (Continued)

Compressor Replacement Steps:

1. Cut off the power. Remove goods from the refrigerator. Use tape to fix the door firmly and prevent it from dropping when the refrigerator is tilted.
2. Slowly tilt the refrigerator forward, relying on a wall or solid object, leaving space for operation. For safety, it should be carried by someone to prevent falling.
3. Cut off the compressor pipeline: 1) Cut the process pipeline. 2) Cut the low-pressure muffler. 3) Cut the high-pressure exhaust pipe.

Diagram shows the compressor with numbered points indicating where to cut the pipelines: process pipeline (1), low-pressure muffler (2), high-pressure exhaust pipe (3).

4. 4-1) Remove the screws (for some models): Two screws outside, one screw inside.
5. 4-2) Remove the metal clamp (for some models): Disassemble the metal clamp that fixes the electric appliance shield.

Diagrams show screw locations and the removal of a metal clamp securing an electric shield.

6. 5) Remove the clipping strip. Slowly pull it out.

Diagram shows removal of a clipping strip.

7. 6) Remove the protective cover. Pry the protective cover slowly from the upper part and pull it out.

Diagram shows removal of a protective cover.

8. 7) Remove the starter and protector. Unplug the starter and protector (use a screwdriver to pry it slowly).

Diagram shows removal of the starter and protector.

9. 8) Loosen the screw of the compressor bottom plate. Remove the floor together with the compressor from the box.

Diagram shows loosening screws on the compressor bottom plate and removing the compressor assembly.

10. 9) Use the wrench to remove the bolts by steps 4, 5, 6, 7. Replace the compressor and reverse the process to complete installation.

Diagram shows bolt locations on the compressor.

11. 10) Use a Pipe cutter to cut off the condenser tube (8), then shear off the capillary tube (9) using capillary tube scissors.

Diagrams show using a pipe cutter on a tube and scissors on a capillary tube.

12. 11) Replace the compressor and weld the compressor pipeline: Weld the process pipeline (10), weld the low-pressure muffler (11), weld the high-pressure exhaust pipe (12).

Diagrams show welding operations on the compressor pipelines.

13. 12) Replace the filter. Cu-Fe tubes welding (13) used Ag welding rod, Cu-Cu tubes welding (14) used Cu welding rod.

Diagrams show welding with Ag and Cu welding rods on different tube types.

14. 13) Vacuum system. The degree of vacuum should be below 6Pa.

Diagram shows a vacuum system setup with a vacuum pump, filter, and compressor.

15. 14) Perfusion refrigerant.

Diagram shows a refrigerant perfusion setup with a gas cylinder, filter, and compressor.

16. 15) Use vise grip pliers to clamp the middle of the process pipe, then seal welding the process tube (15, 16).

Diagram shows clamping a pipe with vise grip pliers and sealing a tube.

9. Temperature Sensing System

9.1 Thermostat

Thermostat Replacement:

1. Remove the nail on the thermostat box assembly. Remove the screws of the fixed temperature control box with a screwdriver.
2. Pull out the knob, remove the socket terminal, and replace the thermostat.

Three images show the steps: removing a nail, removing screws from the control box, and pulling out the knob and socket terminal.

10. Function and Operation

10.1 Operation Panel

Image shows the temperature control knob with settings: COOLER, NORMAL, and OFF.

10.2 Temperature Setting

• Turn the knob counterclockwise: the temperature inside the box becomes higher.
• Turn the knob clockwise: the temperature inside the box becomes lower.
• Please adjust between "COOL" and "COOLER" gear.
• Recommended gear: "NORMAL".
• When the knob is turned to "OFF", the compressor stops running.

10.3 Open Door Alarm (None)

11. Compressor

11.1 Compressor On and Off Control Specifications

The compressor stops when one of the following conditions is met:

1. Tr ≤ Trt;

The compressor starts up when all the following conditions are met:

1. Tr ≥ Trk;

When 1.1 and 1.2 are not satisfied, the compressor maintains its original state.

12. Troubleshooting Method

12.1 Not Cooling

Flowchart for diagnosing "No Cooling": Start -> Check power supply -> Light on/screen display? (No: Check power; Yes: Thermostat OK?) -> Thermostat OK? (No: Reinsert/Replacement; Yes: Compressor accessories OK?) -> Compressor accessories OK? (No: Replace compressor; Yes: Compressor winding OK?) -> Compressor winding OK? (No: Replace compressor; Yes: Leakage and blockage of piping?) -> Leakage and blockage? (No: Find leak, replace filter; Yes: Internal leakage of foam layer-scrapped).

Common phenomena of no cooling:

• The connector has a leak or the terminals are loose.
• Defective protector or starter.
• The connector is reversed, the timer is connected to the wrong line, or the timer is not reset.
• Leakage of the refrigeration system, welding plugs, or insufficient capillary depth of the dryer leading to a solder plug.

Diagram shows compressor winding resistance measurement points (R/M, S, C) and typical resistance values (PTC: 16-50Ω, Rmc: 10~200Ω, Rsc: 30~500Ω).

12.2 No Working of Compressor

Flowchart for diagnosing "No working of compressor": Start -> Lamp on/screen display? (No: Check power; Yes: Compressor power off for 5 min?) -> Compressor power off? (No: Check after 5 min; Yes: Voltage output of PCB terminal OK?) -> Voltage OK? (No: Reinsert/replacement; Yes: Thermostat OK?) -> Thermostat OK? (No: Replace thermostat; Yes: Compressor accessories OK?) -> Compressor accessories OK? (No: Replace compressor; Yes: Compressor winding OK?) -> Compressor winding OK? (No: Replace compressor).

12.3 Thermostat Malfunction-Undercooling

Flowchart for diagnosing "Thermostat malfunction-Undercooling": Start -> Button of thermostat knob in the maximum gear? (Yes: Throttle opened?) -> Throttle opened? (No: Switch to middle or little file; Yes: Thermostat function OK?) -> Thermostat function OK? (No: Adjust screw of thermostat OK?; Yes: OK) -> Adjust screw OK? (No: Replace the thermostat; Yes: OK).

Note: A clockwise circle, rise 3°C.

12.4 Inside Frosting, No Defrosting

Flowchart for diagnosing "Inside frosting, no defrosting": Start -> Gap in the door seal? (Yes: Heat door seal by blower or replace it; No: High ambient humidity, frequent open and close?) -> High humidity? (Yes: It is a normal phenomenon, reducing frequency of switching the door will reduce frost; No: Large moisture food?) -> Large moisture food? (Yes: Seal food before putting in the refrigerator; No: Air duct block?) -> Air duct block? (Yes: Clear food up to keep air duct smooth, Adjust air duct switch; No: Defrosting system failure?) -> Defrosting system failure? (Yes: Check defrosting parts OK?; No: Defrost by hand and recheck whether it failure again) -> Check defrosting parts OK? (No: Replace; Yes: OK).

12.5 Inside Frosting, No Defrosting - Maintenance Guidelines

Door Seal:

1. Check door seal for gaps or edge warping. If found, replace the door seal. Ensure proper installation, pressing flat and checking for gaps.
2. Confirm the landing edge between the bottom door sealed magnetic stripe and sheet metal side is generally 6-10mm. Errors (e.g., 2mm or 20mm) may indicate door or box deformation, requiring replacement of the door seal or door.
3. If the door in the side beam does not close well, check the side between the bottom door body and cabinet. A gap <12mm indicates hinge issues; expand hinge positioning holes and re-install.

Flash seam between box body and buccal frame:

1. If the inner box has a crack with a mouth frame, it can lead to cold leakage. White putty paste can be used for maintenance.
2. If sheet metal has a significant 45-degree step, preventing the door seal from fitting, use a flat PVC board as a mat, and tap with a plastic mallet.

Throttle:

1. Confirm throttle switch operates normally. If not, air door or line communication may have failures; replace air door or repair line.
2. If the throttle switches normally, check for air leakage after it closes. If air leaks, the throttle is bad or blocked; identify the reason and perform maintenance.

Installation of air duct and foam:

1. If the air duct cover (plastic) and duct foam (EPS) are not installed tightly, cold air can blow on the plastic, causing icing.
2. Re-install the air duct to make it compact. (536 series duct seal structure is better, with lower occurrence probability).

Freezing sensor:

If the refrigerator continues to make ice after reaching the set temperature, test the sensor resistance from the motherboard. If the resistance is inconsistent with the actual temperature, the sensor may be bad; replace the temperature sensor (resistance values are in an annex, not provided here).

Improper Use

1. The user accidentally accumulates hot food near the refrigerated sensor, preventing it from experiencing the true cabinet temperature for a short period. The refrigerating chamber will temporarily cool off but recover after the food temperature lowers.

2. It is recommended not to place too much food near the sensor or throttle, especially the refrigerator throttle.

Motherboard Broken

If the motherboard is bad, control will be disordered, requiring replacement of the motherboard.

Poor Installation of Bottom Beam and Side Plate

1. The bottom beam incline causes a step between the bottom beam and the side plate.

2. This results in the door seal not fitting fully into the sheet metal. Use a flat PVC board as a mat, and maintenance personnel can use a plastic mallet for knocking.

3. Ultimately, the door seal airbag can be flat sheet metal attached to the box body.

12.6 Light is Not On

Flowchart for diagnosing "Light is not on": Start -> Display control or cooling OK? (No: Check power; Yes: Inside filament disconnected?) -> Filament disconnected? (No: Replace; Yes: Insertion of wiring harness OK?) -> Wiring harness OK? (No: Reinsert; Yes: Output of mainboard voltage normal?) -> Voltage normal? (No: Replace the mainboard; Yes: Does Door switch contact normally?) -> Door switch contact? (No: Replace/maintenance; Yes: OK).

12.7 Noise

Flowchart for diagnosing "Noise": Start -> Products placed stable? (Yes: Confirm noise source?) -> Confirm noise source? (No: Reposition/adjustment; Yes: Fan noise?) -> Fan noise? (Yes: Fan blades affected by foreign matter? or Affected by ice? -> Defrost system malfunction; No: Noise from air duct?) -> Noise from air duct? (Yes: Clear foreign matter; No: Noise from inside evaporator?) -> Noise from evaporator? (Yes: Tittering sound of refrigerant is normal; No: Noise from compressor case?) -> Noise from compressor case? (Yes: Pipeline mutual collision? -> Pipeline relocation; No: Noise from compressor?) -> Noise from compressor? (Yes: Shake the compressor, if not fixed, replace it; No: Noise from side of box body?) -> Noise from side of box body? (Yes: Tittering sound of refrigerant is normal; No: Noise from timer?) -> Noise from timer? (Yes: Reinstallment or replace (Electronical without timer); No: OK).

13. Figures and Details of Repair Parts

See this section in the TSP (Technical Support Platform).

Entry Guidelines (TSP System)

Where:

• Chrome Browser
• Google
• https://tsp.midea.com/

How:

• Midea user: Same as your MIP account & password.
• Overseas customer: Account: Generated by TSP (provided by administrator). Each customer has a code in Midea Group (G/E + seven numbers). If you buy different categories from Midea group, you can see all product information by one account.
• Password: abcd1234 (please revise after login in). If the input error occurs more than 5 times, the account will be locked and require administrator unlock.

Admin team:

• REF: Jamie Liu (liujc5@midea.com)
• IT: Martin He (dingding.he@midea.com)

Logos for Midea and WiFi are displayed, with text "ON LINE ANY TIME ANY WHERE".

End Matter

Waste Disposal Information: The symbol on the product or packaging indicates it must not be disposed of with household waste. Hand it over to a designated collection point for recycling of waste electrical and electronic equipment. This helps conserve natural resources and ensures environmentally sound recycling. For more information, contact your local authority or the place of purchase.

MIDEA Appliances After Sales Website:

• For more information about Midea appliances after sales, please visit tsp.midea.com.
• For more information about the service manual, please visit tsp.midea.com.
• For more information about the EV and SBOM, please visit tsp.midea.com.

How to Login TSP System:

• Use Google browser: https://tsp.midea.com/
• Internal User: Use MIP account and Password.
• Customer: Access: Generated by TSP (provided by administrator). Password: abcd1234 (please revise after login in).

Midea Refrigerators Contact Information:

For detailed technical information from the manufacturer, please contact:

Refrigeration Division
Overseas Sales Company
Email: xxx@midea.com
Address: No. 176, Jinxiu Avenue, Economic-Technological Development Area, Hefei, Anhui, China