Code 38-31 VFD Compressor Fault - Estimator — VFD estimator issue during compressor start

What does 38-31 mean?

The VFD Estimator, used in the compressor starting process, has encountered a fault. While active, the PEV will open and the compressor will continue attempts at restarting. Three continuous occurrences will result in a lockout (Code 38-71).

• Incorrect VFD model or compressor model parameters for the unit.
• High starting torque.
• Compressor damage.

Click steps to track your progress.

1. 1

   Allow the system to attempt restarting, as the PEV will open to assist.

2. 2

   If the problem persists, verify that the VFD model and compressor model are correct for your unit (technician step).

3. 3

   If models are correct, repeated malfunctions indicate possible compressor damage, which would require replacement (technician step).