Diagnosing and Fixing Fault Code 44 on FE4 or FE5 Infinity Evolution Fan Coils

Have you ever had a fault code 44 on a FE4 or FE5 infinity or evolution fan coil? Do you know what it means?

The explanation is actually very simple. Fault code 44 indicates a blower motor communication fault. This means the fan coil control board is unable to communicate with the blower motor.

When this code appears, the issue will always be related to one of three components:

1. The fan coil control board

2. The wiring harness

3. The blower motor

How do we trouble shoot this fault code? This article offers a simple series of troubleshooting options to help determine what may have gone wrong. 

First confirm you are getting high voltage to the motor 208/230VAC. Check continuity on the wiring harness from the board to the motor.

Next check for 12VDC coming from the board to the motor. Check for 12vdc on wires 1 and 4 at the board, the best thing to do — because it is hard to back pin the plug — is the remove the plug from board and check directly at the board.

If you have 12VDC at the board the motor is bad. If you do not have 12vdc at the board the board is bad.

This information can be found in the installation manual and the service manual. If you have any troubleshooting questions, you can contact the Mingledorff’s Tech Service team with questions. Below are images from the service manual and the Mingledorff’s training guide that may help during the troubleshooting process.