Johnson Controls R SERIES Installation And Maintenance Manual page 62

P6 Drive-to-main-control communication error
Lc Compressor Startup Failure
P5 Compressor current protection
H7 Compressor motor desynchronizing
H5 IPM protection
Ld Phase loss
Lc is displayed on
the wired controller
Lc is displayed in
the mainboard 88
indicating light
Replace the
Yes
mainboard. Does it
work normally?
Replace the
compressor
Works normally
P5, H7, H5 or Ld is displayed
on wired zone controller
P5, H7, H5 or Ld is displayed
in the mainboard 88
indicating light
No
Is the compressor
phase sequence right?
Yes
Yes
Is the compressor wire
terminals tightened
No
Replace the mainboard.
Does it work normally
No
Replace the compressor
54
No
adjust the
compressor
phase sequence
Tighten the
compressor wire
terminals
Yes
Work normally