Fisher FSPI-180AE1 Service Manual page 61

Troubleshooting
2.4.2.10. 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:
Electrical Control System 61