Mitsubishi Electric MUZ-AP25VG-E1 Service Manual page 58

NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.).
Upper lamp Abnormal point
(Indoor unit) (Failure mode/protection)
10-time blink Discharge temperature
2.5 seconds
OFF
11-time blink Bus-bar voltage (DC)
2.5 seconds
OFF
Each phase current of
compressor
14-time blink Stop valve (Closed valve)
2.5 seconds
OFF
4-way valve/
Pipe temperature
16-time blink Outdoor refrigerant system
2.5 seconds
abnormality
OFF
OBH789H
LED indication
(Outdoor P.C. board)
Temperature of discharge temperature
thermistor has been 50°C or less for
20 minutes.
—
8-time blink Bus-bar voltage of inverter cannot be
2.5 seconds OFF detected normally.
9-time blink Each phase current of compressor
2.5 seconds OFF cannot be detected normally.
14-time blink Closed valve is detected by
2.5 seconds OFF compressor current.
16-time blink The 4-way valve does not work
2.5 seconds OFF properly.
The indoor coil thermistor detects an
abnormal temperature.
1-time blink 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.
58
Condition Remedy
• Refer to 12-5. "Check
of LEV".
• Check refrigerant
circuit and refrigerant
amount.
• Refer to 12-5. "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 12-5.
"Check of outdoor
refrigerant circuit".
Indoor/outdoor
Outdoor unit
unit failure
failure mode
mode recall
recall function
function
○
—
○
—
○ ○
○ ○