Mitsubishi Electric MSY-GL-NA Series, Service Manual

Page: 45 / 76

45
The upper
lamp of the
OPERATION
INDICATOR
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
10-time blink
2.5 seconds
OFF
Discharge temperature
—
Temperature of discharge temperature
thermistor has been 122°F (50°C) or
less for 20 minutes.
• Refer to 10-5. "Check
of LEV".
• Check refrigerant
circuit and refrigerant
amount.
—
○
11-time blink
2.5 seconds
OFF
Bus-bar voltage (DC) 8-time blink
2.5 seconds OFF
Bus-bar voltage of inverter cannot be
detected normally.
• Refer to 10-5. "How
to check inverter/
compressor".
—
○
Each phase current of
compressor
9-time blink
2.5 seconds OFF
Each phase current of compressor
cannot be detected normally.
14-time blink
2.5 seconds
OFF
Stop valve (Closed valve) 14-time blink
2.5 seconds OFF
Closed valve is detected by
compressor current.
• Check stop valve.
○ ○
4-way valve/
Pipe temperature
16-time blink
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.
16-time blink
2.5 seconds
OFF
Outdoor refrigerant system
abnormality
1-time blink
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.).
OBH733J