31
POWER 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 50°C or less for
20 minutes.
• Refer to 12-5.
"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 12-5. "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 *1
Stop valve (Closed valve)
14-time blink
2.5 seconds OFF
• Closed valve is detected by
compressor current.
• An abnormality of the indoor
thermistors, the defrost thermistor or
ambient temperature thermistor is
detected.
• Check stop valve.
• Refer to "TEST
POINT DIAGRAM
AND VOLTAGE" on
the service manual
of indoor and
outdoor unit for the
characteristics of the
thermistors. (Do not
start the operation
again without repair to
prevent hazards.)
○
○
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.
• An abnormality of the indoor
thermistor is detected.
• Check the 4-way
valve.
• Replace the inverter
P.C. board.
• Refer to "TEST
POINT DIAGRAM
AND VOLTAGE" on
the service manual
of indoor and
outdoor unit for the
characteristics of the
thermistors. (Do not
start the operation
again without repair to
prevent hazards.)
16-time blink
2.5 seconds
OFF *1
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.
• An abnormality of the indoor
thermistors, the defrost thermistor or
ambient temperature thermistor is
detected.
• Check for a gas leak
in a connecting piping
etc.
• Check the stop valve.
• Refer to 12-5.
"Check of outdoor
refrigerant circuit".
• Refer to "TEST
POINT DIAGRAM
AND VOLTAGE" on
the service manual
of indoor and
outdoor unit for the
characteristics of the
thermistors. (Do not
start the operation
again without repair to
prevent hazards.)
○
○
*1 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit.
First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the refrigerant circuit, or no blockage points (e.g.
clogged or closed valves) in the refrigerant circuit that cause an increase in pressure.
If there is no abnormal point like above and the system operates cooling and heating modes normally, the indoor thermistor might have a problem, resulting in
false detection.
Check both the indoor coil thermistor and the room temperature thermistor, and replace faulty thermistor(s), if any.
(Do not start the operation again without repair to prevent hazards.)
NOTE:
Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.).
OBH903
