Lennox MWMA009S4-*L, Руководство по обслуживанию

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143
Error Code: P0
Description: IPM module or IGBT over current protection.
General Note:
When the voltage signal that IPM sends to the compressor drive chip is abnormal, the display LED will show “P6” and unit
will turn off.
P6
Check whether the voltage range
of P-N on IPM module is normal?
277-356VDC for 18-30KBtu/h; 277-
410VDC for 36KBtu/h
Check whether the connecting wiring
between main board and the IPM
module is connected tightly.
Yes
Yes
No
Check whether
the input power
supply is cor-
rect? 208-230V,
1PH, 60Hz
No
No
Correct the incom -
ing power problem,
then check whether
the system operates
normally
Check whether the
power supply line
is connected cor-
rectly and tightly.
No
Connect it correctly
and tightly, check
ok or not?
Yes No
Check whether
the lines in E-
part box are con-
nected tightly.
No Connect it tightly,
check ok or not?
No Yes
Check whether the bridge rectifiers
are normal? Use the multimeter to
measure the resistance between
each two terminals, check whether
there is the condition that value of
resistance is 0.
Replace the
bridge rectifiers.
No
Yes
Check whether the wiring
of each reactor is correct?
Replace the wiring
or reactor or replace
the PFC module
No
No
Connect it tightly,
unit operates
correctly?
No
Yes
Replace the IPM
module, check
whether the system
works normally.
No
Check if the outdoor
fan runs properly
or the outdoor unit
ventilation is good.
For AC fan models,
check whether the resis -
tance of the fan motor
is normal. If not, replace
the fan motor. For DC
fan models, refer to the
solution of fan speed
malfunction (E8) . Find
out the cause and repair
it.
Yes
No
Replace the main board;
check whether the system
operates normally?
No
Yes
Replace the compressor,
check whether the system
operates normally?
Problem Solved
Yes
Yes
Yes
Check whether the connecting wiring
to the compressor is connected cor -
rectly and tightly
Connect it tightly,
check ok or not?
No
Yes