Midea MOU-12HDN1-Q - Page 58

Troubleshooting MCAC-UTSM-2008-05
56 Outdoor Units
9. Running lamp flash at 5Hz and Defrosting lamp on: Compressor discharge temperature protection
Runnin
g
lam
p
flash at 5Hz and Defrostin
g
lam
p
on
Compressor discharge temperature protection
Check whether the compressor discharge temp. more than 115°C ?
No
Check whether the wiring connection is right
between compressor discharge temp.
sensor and PCB according to wiring
diagrams
Yes
Validate: Check whether the resistance of compressor
discharge temp. sensor is right refer to the Annex 2
No
Correct the wiring connection
Yes
Replace outdoor main board
Judge: The discharge temp. sensor is broken
No
Replace the compressor
discharge temp. sensor
Check whether the refrigerant is leakage
Stop leaking and add refrigerant
Yes
Yes