Fault codes covered
39-14
A code 39-14 is declared when the commanded speed is greater than 200rpm and differs from actual speed (as reported from fan to VFD) by more than 20%. This fault is also declared when the commanded speed is 0 and the VFD is receiving greater than 80rpm feedback from fan motor. The most likely scenario for this fault is a partial physical blockage of blade, ice buildup on fan blade, extreme coil blockage that loads blade heavily, or bearings with high resistance to spinning.
Source: ACHPVSR454-02SM troubleshooting pages.