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10.6.2 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
IPM short
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
P WB.
Abnormal
Yes
Is
IPM PWB floating
?
from the heat sink
No
Check
the AC power
supply voltage when
compressor rotate.(rated
voltage±10%)
Normal
Yes
Cooling mode?
.
No
Check indoor
Abnormal
exchange sensor
and discharge
sensor
Modify or replace
the sensor
Normal
Check indoor
heat exchange
.
Abnormal
Clean indoor heat
Normal
exchange
Check the refrigerant
amount
Check the discharge
press
Yes
Fix
IPM PWB with screws
securely.
Check outdoor
exchange sensor
and discharge
sensor
Modify or replace
the sensor
Normal
.
Abnormal
Check outdoor
heat exchange
Clean outdoor
heat exchange
Check the installation
condition
Abnormal
.
33
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