Mitsubishi Electric MUZ-HE09NA, Service Manual

Page: 35 / 62

35
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.
•
•
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
1
Intelligent power module: MUZ-HE24NA
Power module: Other models
OBH686