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4. Service procedures
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Replace outdoor unit
control PCB.
(2) [Alarm “P26”]
HIC PCB trouble)
IGBT short-circuit protection on inverter control (IPDU) PCB
Is power OK?
Correct power line.
Are
circuit wiring,
connector
connections, and
reactor
connections
OK?
Correct.
Has filter PCB
RY001 or RY002
relay activated?
Has filter PCB
AC fuse blown?
Replace filter PCB.
Disconnect
U.V.W. output
terminal on HIC PCB and
start operation.
Does alarm
“P26”
occur?
Replace HIC PCB.
Is
compressor OK?
(Check for layer
short circuit.)
Replace compressor.
Is
resistance
between
each terminal on
HIC PCB OK?
(See following
page.)
Check HIC PCB.
Replace if PCB
has failed.
4