Carrier 40MBQB09D-3 Service Manual

63
P6 (IPM module protection) error diagnosis and
solution
Error Code P6
Malfunction decision conditions
When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED
shows “P6” and the AC turns off.
Supposed causes
S Wiring mistake
S IPM malfunction
S Outdoor fan ass’y faulty
S Compressor malfunction
S Outdoor PCB faulty
Troubleshooting
IPM module protecon
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
Yes
No
Yes
Check whether the input
power supply is correct?
208-230V, 1N, 60Hz
No No
Regulate it to correct, then
check whether the system
can work normally?
Check whether the
power supply line is
connected correctly and
ghtly
Yes
Connect it correctly
and ghtly, check ok
or not?
No
Check whether the connecng
line between main board and
the IPM module is connected
ghtly
Yes
Connect it ghtly,
check ok or not?
No
No
No
Connect it well, check
ok or not?
Check whether the connecng
line of the compressor is
connected correctly or ghtly
Replace the IPM module,
check whether the system can
work normally?
No
No
Replace the main board; check
whether the system can work
normally?
No
Replace the compressor, check
whether the system can work
normally?
Check whether the lines
in E-part box are
connected ghtly
Yes
Connect it ghtly,
check ok or not?
No
No
Yes
No
Replace the bridge recfiers
Check whether the bridge recfiers are
normal? Use the mulmeter to measure
the resistance between each two
terminals, check whether there is the
condion that value of resistance is 0
Check whether the connecng line of
every reactor is normal? If the line is
broken, the resistance of the two ports is
∞˄models except for M4OC-36HRFN1-
M˅˗Check whether the PFC module
broken
Replace the connecng line or
reactor or replace the PFC
module
Yes
No
No
Yes
Trouble is solved
Check if the outdoor fan
runs properly or the outdoor
unit venlaon is good.
No
Refer to
8
.5 Trouble Criterion Of
Main Parts, check whether the
resistance of the fan motor is
normal. If not, replace the fan
motor.
For other models, r efer to
the soluon of fan speed has
been out of control
malfuncon . Find out the cause
and have it solved.
Yes
Yes
Yes

Carrier 40MBQB09D-3 Specifications

General

Brand	Carrier
Model	40MBQB09D-3
Category	Air Conditioner
Language	English