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Current protection
When the outdoor unit input current exceeds 15.5A.
These symptoms do not mean any abnor-
mality of the product, but check the follow-
ing points.
• Air filter clogging.
• Amount of gas.
• Short cycle of indoor / outdoor air flow.
Indication
LED 1
(red)
LED 2
(Yellow)
Abnormal point
Detecting method
Check points
Symptom: Outdoor unit operates (The compressor operates at reduced frequency)
1-time
Lighting
Overload protection
When the compressor load exceed the specified value.
2-time
Lighting
High pressure protec-
tion
When indoor pipe temperature exceeds 55
:
during heating.
3-time
Lighting
Defrosting in cooling
When indoor pipe temperature falls to 6
:
or below during cooling.
3-time
Lighting
Discharge temperature
protection
When the discharge temperature exceeds 111
:
.
4-time
Lighting
Low discharge tempera-
ture protection
When the state with low discharge temperature of which 50.4
:
or below
in cool and 48.8
:
or below in heat for 20 minutes.
7-time
Lighting
Defrost thermistor
When a short or open circuit occurs in the defrost thermistor during heat-
ing.
• Check the characteristic of the defrost
temperature thermistor.
Refer to “
Z
” on page 89.
• Check the connector. (CN663)
Indication
LED 1
(red)
LED 2
(Yellow)
Abnormal point
Detecting method
Check points
Symptom: Outdoor unit operates
5-time
Lighting
Power factor detection
When the compressor power factor cannot be detected.
• Check the compressor wiring.
6-time
Lighting
OB245--3qxp 02.10.22 4:15 PM Page 73