38
OPERATION
INDICATOR
upper lamp
(Indoor unit)
Abnormal point
(Failure mode / protection)
LED indication
(Outdoor P.C. board)
Condition Remedy
Indoor/
outdoor unit
failure mode
recall function
Outdoor unit
failure mode
recall function
11-time fl ash
2.5 seconds
OFF
DC voltage
8-time fl ash
2.5 seconds OFF
DC voltage of inverter cannot be
detected normally.
• Refer to 10-5. "How
to check inverter/
compressor".
—
○
Each phase current of
compressor
9-time fl ash
2.5 seconds OFF
Each phase current of compressor
cannot be detected normally.
12-time fl ash
2.5 seconds
OFF
Overcurrent Compressor open-
phase
10-time fl ash
2.5 seconds OFF
Large current fl ows into intelligent
power module (IPM)/power module
(IPM) 1.
The open-phase operation of
compressor is detected.
The interphase short circuit occurs
in the output of the intelligent power
module (IPM)/power module (IPM) 1.
The compressor winding shorts circuit.
• Reconnect compressor
connector.
• Refer to 10-5. "How
to check inverter/
compressor".
—
○
14-time fl ash
2.5 seconds
OFF
Stop valve (Closed valve)
14-time fl ash
2.5 seconds OFF
Closed valve is detected by compressor
current.
• Check the stop valve
○
○
4-way valve/
Pipe temperature
16-time fl ash
2.5 seconds OFF
The 4-way valve does not work
properly.
The indoor coil thermistor detects an
abnormal temperature.
• Check the 4-way valve.
• Replace the inverter
P.C. board.
Outdoor refrigerant
system abnormality (
MUZ-
HM09/12NA(2) -
U1
)
1-time fl ash
2.5 seconds OFF
A closed valve and air trapped in the
refrigerant circuit are detected based on
the temperature sensed by the indoor
and outdoor thermistors and the current
of the compressor.
• Check for a gas leak
in a connecting piping
etc.
• Check the stop valve.
• Refer to 10-5.
“Check of outdoor
refrigerant circuit”.
○
○
NOTE:
Blinking patterns of this mode differ from the ones of
TROUBLESHOOTING CHECK TABLE (10-3.).
OBH747C
