Midea MSE-09CRN1-BQ8W Service Manual page 46

For 18K and 24K models
Be sure all the wires(including power wires and connection wires)
Check if AC 208-230V power supply outputs to outdoor PCB
Check if AC 208-230V exists at primary coil of outdoor (and
Check if AC 12V exist at second coil of outdoor (and indoor)
Take off the secondary plug of transformer, and then check if AC
12V exist at secondary coil of outdoor (and indoor) transformer
Service manual
is OK
Yes
Yes
indoor) transformer
Yes
transformer
No
No
Outdoor (or indoor)
transformer is defective
- 43 -
No
Change good ones
No
Outdoor (or indoor) PCB is
defective
Yes
Outdoor (or indoor) PCB is
Yes
defective