T903_O: PFC Overcurrent
On the VSODU, this fault would be displayed on the seven-segment LED as a number 15. Keep in mind, a 15 is an inverter fault, but does not specify any particular inverter fault. You will need to read the exact fault at the EcoNet thermostat.
The Drive LED's will not display any fault codes.
The drive itself is experiencing high current, not the compressor. PFC stands for Power Factor Correction. If the PFC is drawing high current, it may be that the Choke connections are loose or the choke itself is defective. A failed choke is rare but also very difficult to field troubleshoot. Chokes are rated in inductance and field technicians really cant read this.
Disconnect the power from the unit and allow time for the onboard capacitors to discharge. Generally its best to allow a minute or two for them to discharge. Check the connections from the drive to the choke and make sure they are tight. Loose connections can cause an increase in current flow. If they are tight, remove them and check the resistance through the choke to make sure it is not open. The resistance through the choke is very low and low enough its hard to validate accurately. If its open, replace the choke.
If after checking and replacing the choke results in continuous alerts, replace the drive. It is imperative to use the appropriate choke for the drive and compressor combination with the exception of the case below.
If replacing a choke on a (-)P1748, use the choke listed in the parts list for a (-)P1760
