Mitsubishi Electric MUZ-FH06NA Service Manual page 33

The left
lamp of the
OPERATION Abnormal point
INDICATOR (Failure mode/protection)
lamp
(Indoor unit)
10-time fl ash Discharge temperature
2.5 seconds
OFF
11-time fl ash DC voltage
2.5 seconds
OFF
Each phase current of
compressor
14-time fl ash Stop valve (Closed valve)
or more
2.5 seconds
OFF
4-way valve/
Pipe temperature
Outdoor refrigerant system
abnormality
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.).
OBH684C
LED indication
(Outdoor P.C. board)
Temperature of discharge temperature
thermistor has been 122°F (50°C) or
less for 20 minutes.
—
8-time fl ash DC voltage of inverter cannot be
2.5 seconds OFF detected normally.
9-time fl ash Each phase current of compressor
2.5 seconds OFF cannot be detected normally.
14-time fl ash Closed valve is detected by
2.5 seconds OFF compressor current.
16-time fl ash The 4-way valve does not work
2.5 seconds OFF properly.
The indoor coil thermistor detects an
abnormal temperature.
17-time fl ash A closed valve and air trapped in the
2.5 seconds OFF refrigerant circuit are detected based
on the temperature sensed by the
indoor and outdoor thermistors and the
current of the compressor.
33
Condition Remedy
• Refer to 10-5. "Check
of LEV".
• Check refrigerant
circuit and refrigerant
amount.
• Refer to 10-5. "How
to check inverter/
compressor".
• Check stop valve.
• Check the 4-way
valve.
• Replace the inverter
P.C. board.
• Check for a gas leak
in a connecting piping
etc.
• Check the stop valve.
• Refer to 10-5.
"Check of outdoor
refrigerant circuit".
Indoor/outdoor
Outdoor unit
unit failure
failure mode
mode recall
recall function
function
○
—
○
—
○ ○
○ ○