Carrier 38MGRQ24C 3 Series User Manual

62 Specifications subject to change without notice. 38MGR-04SM
DIAGNOSIS AND SOLUTION (CONT)
IPM module protection error (P6)
Troubleshooting
ERROR CODE P6
MALFUNCTION DECISION
CONDITIONS
When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED displays
“P6” and the AC turns off.
SUPPOSED CAUSES
• Wiring mistake
• IPM malfunction
• Outdoor fan assembly faulty
• Compressor malfunction
• Outdoor PCB faulty
Check whether the voltage range
of P-N on IPM module is normal.
DC277-356V for 18-24KBtu/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
ƟŐŚƚ
Yes
Connect it correctly
ĂŶĚƟŐŚƚ
Is it ok?
No
Yes
ŽŶŶĞĐƚŝƚƟŐŚƚ
Is it ok or not?
No
No
No
Connect well.
Is it ok or not?
Replace the IPM module.
Check whether the system
works normally.
No
No
Replace the main board.
Check whether the system works
normally.
No
Replace the compressor.
Check whether the system works
normally.
Check whether the lines
in E-part box are
ĐŽŶŶĞĐƚĞĚƟŐŚƚ
Yes
ŽŶŶĞĐƚŝƚƟŐŚƚ
Is it ok or not.
No
No
Yes
No
ZĞƉůĂĐĞƚŚĞĐŽŶŶĞĐƟŶŐůŝŶĞŽƌ
reactor or replace the PFC module.
Yes
No
No
Yes
Trouble is solved.
Check if
the outdoor fan runs
properly or if the outdoor
ƵŶŝƚǀĞŶƟůĂƟŽŶ
is good.
No
Check whether the fan motor
resistance is normal. If not,
replace the fan motor.
For other models. refer to the
Fan Speed Out of Control
ŵĂůĨƵŶĐƟŽŶƐŽůƵƟŽŶ
Determine the cause and
resolve it.
Yes
Yes
Yes
Check
whether the
connecting line between
the main board and the IPM
module is connected
tight.
Check whether the
compressor connecting line
is connected correctly.
IPM Module Protection
ŚĞĐŬŝĨƚŚĞďƌŝĚŐĞƌĞĐƟĮĞƌƐĂƌĞŶŽƌŵĂů
hƐĞƚŚĞŵƵůƟŵĞƚĞƌƚŽŵĞĂƐƵƌĞƚŚĞ
resistance between each of the two terminals.
Check whether there is a instance
where the resistance value is 0.
ZĞƉůĂĐĞƚŚĞďƌŝĚŐĞƌĞĐŝĮĞƌƐ
ŚĞĐŬŝĨƚŚĞĐŽŶŶĞĐƟŶŐůŝŶĞŽĨĞǀĞƌLJ
reactor is normal. If the line is broken,
the resistance of the two ports is
ь;ŵŽĚĞůƐ except for M4OC-36HRFN1-M).
Check whether the PFC module is broken.

Carrier 38MGRQ24C 3 Series Specifications

General

Brand	Carrier
Model	38MGRQ24C 3 Series
Category	Air Conditioner
Language	English