Omega WM 09K Service Manual page 52

11.4.2 DC Over Current Error
Error memory is
recorded
Start
Are valves (2-way
or 3-war) close?
Does compressor
rotates?
No
Check IPM lead
wire (UVW)
Modify the connection of
compressor lead wire on
Normal
PWB
Check short
IPM
.
circuit
Replace
Normal
Check compressor
Modify compressor terminal
Normal marking
Replace PWB
Does compressor
rotates?
No
Replace compressor
Air Conditioner Service Manual
Yes
Full open stop valves
Yes
Does compressor
rotates more than
30 seconds?
No
Abnormal
Abnormal
PWB.
Abnormal
Yes
Is floating
IPM PWB
from the heat sink?
No
Check the AC power
supply voltage when
compressor rotate.(rated
voltage±10%)
Normal
Cooling mode?
.
No
Check indoor
Abnormal
exchange sensor
and discharge
sensor
Modify or replace
the sensor
Normal
Check indoor
heat exchange
.
Clean indoor heat
exchange
Normal
Check the refrigerant
amount
Check the discharge
press
Yes
Fix with screws
IPM PWB
securely.
Yes
Check outdoor
exchange sensor
and discharge
sensor
Normal
.
Check outdoor
heat exchange
Abnormal
Check the installation
condition
Abnormal
Modify or replace
the sensor
.
Abnormal
Clean outdoor
heat exchange
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