Midea M4OA-36HFN1-Q User Manual

DM15-01.01.11-01en Service manual
Multi DC inverter R410A. Outdoor unit 67
11.3.2.10 IPM module protection (ODU P6)
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36-42KBtu/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
tightly
Yes
Connectitcorrectly
andtightly,checkok
ornot?
No
Checkwhethertheconnecting
linebetweenmainboardand
theIPMmoduleisconnected
tightly
Yes
Connectittightly,
checkokornot?
No
No
No
Connectitwell,check
okornot?
Checkwhethertheconnecting
lineofthecompressoris
connectedcorrectlyortightly
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tightly
Yes
Connectittightly,
checkokornot?
No
No
Yes
No
Replacethebridgerectifiers
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
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 M4OA-36HFN1-
Q,M4OD-28HFN1-Q, M5OC-36HFN1-
Q）；Check whether the PFC module
broken (for M4OA-36HFN1-Q,M4OD-
28HFN1-Q, M5OC-36HFN1-Q,M50D-
42HFN1-Q)
Replacetheconnectinglineor
reactororreplacethePFC
module(forM4OC-36HRFN1-
M,M50D-42HFN1-Q)
Yes
No
No
Yes
Troubleissolved
Checkiftheoutdoorfan
runsproperlyortheoutdoor
unitventilationisgood.
No
Checkwhethertheresistanceof
the fan motor is normal. If not,
replace the fan motor. For other
models, r
efer to the solution of
fan speed has been out of
control malfunction . Find out
thecauseandhaveitsolved.
Yes
Yes
Yes

Midea M4OA-36HFN1-Q Specifications

General

Brand	Midea
Model	M4OA-36HFN1-Q
Category	Air Conditioner
Language	English