Ipm Module Protection; Trouble Shooting - Pioneer YN018GMFI16M2D Service Manual

9.4.1.6 IPM module or IGBT over-strong current protection diagnosis and solution.
Malfunction decision
conditions
Supposed causes

Trouble shooting:

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 36KBtu/h
Yes
Check whether the connecting
line between main board and
the IPM module is connected
tightly
Yes
Check whether the connecting
line of the compressor is
connected correctly or tightly
Yes
Replace the IPM module,
check whether the system can
work normally?
No
Check if the outdoor fan
runs properly or the outdoor
unit ventilation is good.
No
Replace the main board; check
whether the system can work
normally?
No
Replace the compressor, check
Yes
whether the system can work
normally?
When the voltage signal that IPM send to compressor drive
chip is abnormal, the display LED will show "P6" and AC will
turn off.
● Wiring mistake
● IPM malfunction
● Outdoor fan ass'y faulty
● Compressor malfunction
● Outdoor PCB faulty
Check whether the input
No power supply is correct?
Connect it tightly,
No
check ok or not?
connected correctly and
No
Connect it well, check
No
ok or not?
Check whether the lines
No
For AC fan models, please refer
to 9.4 Trouble Criterion Of Main
Parts, check whether the
Yes
resistance of the fan motor is
normal. If not, replace the fan
Yes
motor. efer to
For DC fan models, r
the solution of fan speed has
been out of control malfunction
. Find out the cause and have it
solved.
Yes
Yes
Trouble is solved
Regulate it to correct, then
No check whether the system
208‐230V, 1N, 60Hz can work normally?
No
Yes
Check whether the
Connect it correctly
power supply line is
No and tightly, check ok
tightly
Yes
No
Connect it tightly,
in E‐part box are No
check ok or not?
connected tightly
Yes
No
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
Yes
Replace the bridge rectifiers
Check whether the connecting line of
every reactor is normal? If the line is
broken, the resistance of the two ports is
∞（models except for M4OC‐36HRFN1‐
M& M4OC‐36HRDN1‐M）；Check
whether the PFC module broken (for
M4OC‐36HRFN1‐M& M4OC‐36HRDN1‐
M)
Replace the connecting line or
reactor or replace the PFC
module(for M4OC‐36HRFN1‐M)
or not?
No
No