Midea MSE-09HRN1-BQ8W - 11.4 Resetting Phenomenon; 11.5 Indoor Fan Speed Control Issues

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