“U0” Insufficient Preheat Time For Compressor - Gree UML600H/A-MP Service Manual

GREE
Troubleshooting:
resistances of two windings are the same; if the insulation
(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.
"PJ" failure startup for
inverter compressor
Check if the UVW wires of
compressor are well connected?
Yes
Check if the
connecting order of
UVW wires of compressor
is correct?
Yes
Check if the resistance value
between different windings of compressor
are normal (the normal value is less than 2 ohm)? If
atainst ground of different windings of compressor
are normal (the normal value is less
than 2 megohm)?
Yes
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).
No
Compressor driver board
is faulted.
Duct type Ducted Type Split Air-Conditioner Units
No
Replace the
compressor
Yes
Clear out foreign matter,
open the valves
Yes
The compressor is damaged,
please replace it.
Yes Replace the compressor
driver board.
.
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