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No.
Symptom
LED indication
Outdoor unit
4-time blink
operates.
2.5 seconds OFF
19
5-time blink
20
2.5 seconds OFF
7-time blink
2.5 seconds OFF
21
8-time blink
2.5 seconds OFF
22
9-time blink
2.5 seconds OFF
23
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 12-6.1.
2. LED is lit during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is "2".
ON
2.5-second OFF
OFF
OBH931
Abnormal point/
Condition
Deceleration of the
Temperature of discharge temperature thermistor exceeds
operational fre-
111°C, compressor frequency lowers.
quency of the com-
pressor by the
discharge tempera-
ture protection
Outside tempera-
When the outside temperature thermistor shorts or opens,
ture thermistor
protective operation without that thermistor is performed.
protection
Low discharge tem-
Temperature
perature protection
of discharge
temperature
thermistor has
been
50°C or less
for 20
minutes.
PAM protection
The overcur-
rent flows into
PAM: Pulse
Amplitude
PFC (Power
Modulation
factor correc-
tion: IC820) or
the bus-bar
voltage
reaches 394 V
or more, PAM
stops and
restarts.
Inverter check
The connector
mode
of compressor
is discon-
nected,
inverter check
mode starts.
0.5-second ON
2.5-second OFF
Condition
"Check of LEV".
• Refer to 12-5.
• Check refrigerant circuit and refrigerant
amount.
This is not malfunction. PAM protection will
be activated in the following cases:
1 Instantaneous power voltage drop. (Short
time power failure)
2 When the power supply voltage is high.
• Check if the connector of the compressor is
correctly connected. Refer to 12-5.
check inverter/compressor".
0.5-second ON
44
Remedy
• Check refrigerant circuit and refrig-
erant amount.
"Check of LEV".
• Refer to 12-5.
"Check of outdoor
• Refer to 12-5.
thermistors".
• Refer to 12-5.
Check of outdoor
thermistors.
"How to
Inverter P.C. board
Blinking →
LED
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