An OHF fault (fault code 16 on the touchscreen) is an overheating fault. The VFD has exceeded the rated temperature. Below are some possible causes and solutions for this fault.
1. The ambient temperature is too high. Schneider VFDs can operate up to a maximum ambient temperature of 50C/122F inside of the VFD control panel. If temperatures are higher than this inside of the VFD control panel, it is recommended not to attempt to operate the fans.
2. The VFD control panel is mounted too close to a heat source. Relocate the VFD control panel further away from the heat source.
3. The internal fan on the VFD has failed. Contact MacroAir Technical Support to verify the functionality of the internal fan.
4. The motor is overloading. While you should see a motor overload fault instead, occasionally you will see a temperature fault. Refer to the motor overload troubleshooting here
5. The VFD is programmed incorrectly. Contact MacroAir Technical Support to verify the VFD programming.
6. The sticker on top of the VFD is present. If the sticker in the below image is present on top of the VFD, remove the sticker and operate the fan to see if it still faults.
7. If everything appears to be correct, it is possible that the VFD has failed and needs to be replaced. Contact MacroAir Technical Support for any replacement warranty parts.
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