Midea DLCMB - Page 45

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 36K-48KBtu/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
is working normally.
Check whether the
power supply line is
connected correctly.
Yes
Connect it ght.
No
Check whether the connecng
line between the mainboard and
the IPM module is well
connected.
Yes
Connect it ght
No
No
No
Connect it well, check
ok or not?
Check whether the connecng
compressor line is connected
correctly.
Replace the IPM module,
Check whether the system is
working normally.
No
No
Replace the main board.
Check whether the system can work
as designed.
No
Replace the compressor. Check
whether the system can work as
designed.
Check whether the lines
in E-part box are
connected ght.
Yes
Connect it ght.
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 the two
terminals. Check whether there is a
condion that resistance value 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
Check whether the PFC module
broken .
Replace the connecng line or
reactor or replace the PFC module.
Yes
No
No
Yes
Issue is resolved.
Check if the outdoor fan
runs properly or the outdoor
unit venlaon is good.
No
Yes
Yes
Yes
For DC fan models, refer to the
solution of fan speed has been
out of control malfunction. Find
the cause and solve it.
DLCM(R/H)B: Service Manual