TOSOT DC INVERTER U-MATCH AIR CONDITIONERS
86
P6 Drive-to-main-control communication error
Lc Compressor Startup Failure
Lc is displayed on
the wired controller
Lc is displayed in
the mainboard 88
indicating lamp
Replace the
mainboard. Does it
work normally?
Replace the
compressor
Work normally
Yes
No
P5 Compressor current protection
H7 Compressor motor desynchronizing
H5 IPM protection
Ld Phase loss
P5, H7, H5 or Ld is displayed
in the mainboard 88
indicating lamp
Is the compressor
phase sequence right?
Yes
Replace the mainboard.
Does it work normally？
No
Replace the compressor Work normally
Yes
adjust the
compressor
phase sequence
Is the compressor wire
terminals tightened？
Tighten the
compressor wire
terminals
Yes
No
No
P5, H7, H5 or Ld is displayed
on the wired controller
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