Midea MCD-18HRFN1-QRC4 Service Manual page 146

Troubleshooting
2.4.4.14. P6 malfunction (For single phase units)
At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or
close to 0, the IPM is defective. Otherwise, please follow the procedure below:
152 Electrical Control System