Mitsubishi Electric MSZ-G09SV Service Manual page 73

Indication
Abnormal point
LED 1 LED 2
(red) (Yellow)
1-time Lighting Current protection
2-time Lighting Overload protection
High pressure protec-
3-time Lighting
tion
3-time Lighting Defrosting in cooling
Discharge temperature
4-time Lighting
protection
Low discharge tempera-
7-time Lighting
ture protection
Indication
Abnormal point
LED 1 LED 2
(red) (Yellow)
5-time Lighting Defrost thermistor
6-time Lighting Power factor detection
Symptom: Outdoor unit operates (The compressor operates at reduced frequency)
Detecting method
When the outdoor unit input current exceeds 15.5A.
When the compressor load exceed the specified value.
When indoor pipe temperature exceeds 55: during heating.
When indoor pipe temperature falls to 6: or below during cooling.
When the discharge temperature exceeds 111:.
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.
Symptom: Outdoor unit operates
Detecting method
When a short or open circuit occurs in the defrost thermistor during heat-
ing.
When the compressor power factor cannot be detected.
73
Check points
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.
Check points
• Check the characteristic of the defrost
temperature thermistor.
Refer to "Z" on page 89.
• Check the connector. (CN663)
• Check the compressor wiring.