Table of Contents
Indication
Abnormal point
LED 1
LED 2
(red)
(Yellow)
Once
Lighting
Current protection
Twice
Lighting
Overload protection
High pressure protec-
3 times
Lighting
tion
3 times
Lighting
Defrosting in cooling
Discharge temperature
4 times
Lighting
protection
Low discharge tempera-
7 times
Lighting
ture protection
Indication
Abnormal point
LED 1
LED 2
(red)
(Yellow)
5 times
Lighting
Defrost thermistor
6 times
Lighting
Power factor detection
12-4. Trouble criterion of main parts
Part name
Defrost thermistor
Evaporation / Gas pipe
temperature thermistor
Discharge temperature
thermistor
Compressor
W
RED
V
U
WHT
BLK
Outdoor fan motor
WHT
P
ORN
RED
BLK
YLW
R. V. coil
Linear expansion valve
WHT
RED
LEV
ORN
YLW BRN
BLU
Symptom: Oudtoor unit operates (The compressor operates at reduced frequency)
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
When a short or open circuit occurs in the defrost thermistor during heat-
ing.
When the compressor power factor cannot be detected.
Measure the resistance using a tester.
(Part temperature -10°C ~ 40°C)
Normal
5kΩ ~ 55kΩ
Measure the resistance using a tester, after warming up the thermistor by holding by hand.
(Part temperature : 20°C ~40°C)
Normal
100kΩ ~ 250kΩ
Measure the resistance between terminals using a tester.
(Winding temperature : -10°C ~ 40°C)
Normal
1Each phase 0.39Ω ~ 0.50Ω
Measure the resistance between lead wires using a tester.
(Part temperature : -10°C ~ 40°C)
WHT - BLK
BLK - YLW
BLK - RED
Measure the resistance using a tester. (Part temperature -10°C ~ 40°C)
Normal
2.6kΩ ~ 3.3kΩ
Measure the resistance using a tester.(Part temperature -10°C ~ 40°C)
Lead wire color
WHT - RED
RED - ORN
YLW - BRN
BRN - BLU
Detecting method
Detecting method
Check method and criterion
Normal
208.4Ω ~ 254.8Ω
42.4Ω ~ 51.9Ω
197.7Ω ~ 241.7Ω
Normal
37.4Ω ~ 53.9Ω
21
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 "F" on page 25.
• Check the connector. (CN663)
• Check the compressor wiring.
abnormal
Opened or short-circuited
abnormal
Opened or short-circuited
abnormal
Opened or short-circuited
abnormal
Opened or
short-circuited
abnormal
Opened or short-circuited
Abnormal
Opened or short-circuited
P Inner protector
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