CARRIER 19XR 6565 Allarmed by "Diffuser Position Fault"

[Andreas70]

Dear friends, I have Carrier 19XR 6565 Chiller. This unit can not be started when the unit indicates alarm "Diffuser Position Fault"...Is there any one of you has experience to facing the same problem? much appreciated if you can share the solution in this forum.
Warm Rgds,

[milkyway]

do a search on here., might help u out., look for an iom

[r404a]

check to see if the diffuser motor shaft is actually turning the actual diffuser shaft, coupling may have come loose. had this happen standing in front of one of these with that fault, didnt know jack about these machines

r404a

[Andreas70]

please take note this alarm showed before the machine initiate to start not during running thanks

[pecmsg]

From IOM Manual
Page 108

ICVC FAULT STATE: Fault Code 247

Primary Message: Protective Limit

Secondary Message: Diffuser Position Fault

Primary Cause: 247->Diffuser Fault: Check Guide Vane and Diffuser Actuators.

Additional Cause/Remedy: Confirm that DIFFUSER OPTION in SETUP 2 screen has not been Enabled if compressor does not have a split ring diffuser. May indicate rotating stall condition. Check DIFFUSER CONTROL Schedule in SETUP 2 screen. Check DIFFUSER PRESSURE rotating stall transducer wiring to CCM J3-10, J3-11 and J3-12. Confirm that 4.3 kilohm load resistor is installed between CCM J3-7 and J3-8. Confirm that DIFFUSER PRESSURE transducer is secured to the threaded fitting on the compressor housing. Check for proper operation of diffuser and inlet guide vane actuators including inlet guide vane calibration. Check wiring between CCM J4-9 and J4-10 and the guide vane position feedback potentiometer. Check diffuser and guide vane actuator coupling for rotating slip. Check for electrical noise in CCM Diffuser Pressure wiring. Install noise suppressor in parallel with Motor Temperature sensor on J4-23 and J4-24. Do not continue to operate compressor except for diagnostic purposes.