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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
P6/PC 00 (Inverter module (IPM) malfunction) diagnosis and solution
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
IPM module protection
Check whether the voltage range
of P-N on IPM module is normal
DC277-356V for 18-27KBtu/h;
DC277-410V for 36-48KBtu/h
Is the connecting line between
Is the connecting compressor
Replace the IPM module,
check whether the system can
Check if the outdoor fan
runs properly or the outdoor
unit ventilation is good.
Replace the main board; check
whether the system can work
Replace the compressor, check
whether the system can work
Yes
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
P6/PC 00
When the voltage signal that the IPM sends to the compressor drive chip is abnormal, the display LED displays
P6 and unit turns off.
Wiring mistake
IPM malfunction
Faulty outdoor fan assembly
Compressor malfunction
Faulty Outdoor PCB
Yes
No
main board and the
IPM module is well
connected?
Yes
No
No
line connected
correctly and tight?
Yes
No
work normally?
No
Refer to the Fan Speed is Out
Yes
of Control. Determine the
No
normally
No
normally
Check whether the input
No
power supply is correct
208-230V, 1N, 60Hz
Yes
Connect it correctly
Check whether the
and tight
power supply line is
connected correctly and
tight
Yes
Connect it correctly
and tight
Check whether the lines
in E-part box are
connected tight
Check whether the bridge rectifiers are
normal. Use the multimeter to measure
terminals. Check whether the resistance
Yes
cause and resolve.
Is the connecting line for every reactor
the resistance of the two ports is
(for M4OF-36HFN1-M & M5)F-48HFN1-m)
Yes
Yes
Problem solved
68
Regulate it to correct, then
No
check whether the system
can work normally
No
Connect it correctly
No
and tight
No
Connect it correctly
No
and tight
Yes
No
the resistance between the two
value is 0.
No
Yes
Replace the bridge rectifiers
normal? If the line is broken,
Check if the PFC broken module
No
Replace the connecting line or
reactor or replace the PFC
module(for M4OF-36HFN1-
M&M5OF-48HFN1-M)
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