Gree CF01000730, Service Manual

Page: 113 / 129

GREE Duct type split Air conditioner Inverter Series
111
Troubleshooting:
“
PJ” failure startup for
inverter compressor
Compressor driver board
is faulted.
Yes Replace the compressor
driver board.
No
Check if the UVW wires of
compressor are well connected?
Yes
No
Replace the
compressor
Check if the resistance value
between different windings of compressor
are normal (the normal value is less than 2 ohm)? If
resistances of two windings are the same; if the insulation
atainst ground of different windings of compressor
are normal (the normal value is less
than 2 megohm)?
Yes
Yes
Clear out foreign matter,
open the valves
Check if the system is blocked, if the
valves are open?
Yes
Check if the control
valve of system is in normal condition.
If the oil-balancing valve works normally, if the
control terminals are well inserted, etc. If they
are normal, please see the
next step;
Yes
If there are any other
faults? Such as desynchronizing protection
of compressor (P9), IPM module protection (P6),
overcurrent protection of
compressor (P5).
Yes
The compressor is damaged,
please replace it.
Check if the
connecting order of
UVW wires of compressor
is correct?
Yes
(55) “U0” insufficient preheat time for compressor
Error display: ODU mainboard and IDU display .
Applicable model: all models.
Condition and method for fault judgement: Check the preheat time of oil temperature before
startup of compressor, if it is less than 8 hours, it will report the error.
Possible cause: ——
Troubleshooting:
Preheat the unit for over 8 hours before startup.