DIY Series 71: Midea Minibar Malfunction

Midea Minibar MS-50 (50L) Malfunction

Symptoms:

• Suddenly not cold and ice started melting. 
• Suspect either PTC Relay / Overload / both of them spoilt

Photos:

1. Front view of Minibar
2. Back view (top) with Electric Diagram
3. Back view (bottom) with compartment for compressor
4. Unscrew 3 screws in order to remove to cover
5. After unscrewed, you may remove the cover
6. Remove the GND wire
7. Remove the PTC Relay
8. Remove the Overload 
9. Check the PTC Relay using multimeter (Good: Close to 0Ω, NG: Open Loop)
10. Check the Overload using multimeter (Good: Close to 0Ω, NG: Open Loop)
11. Dismantle the PTC Relay, found the round plate inside already broken
12. Check suitable PTC Relay for replacement (12Ω to 33Ω)
13. Check suitable PTC Relay type. I choose 1-Pin 22Ω
14. Check the new PTC Relay using multimeter (Reading: 19.4Ω)

Costs Involved:

• PTC Relay (1-Pin 22Ω): US$1.50 to US$2.50