(2) Air conditioner does not operate
1. Circuit breaker trips (or fuse blows).
(a) When the circuit breaker is set to ON, it trips immedialely.
• There is a possibility of ground fault.
• Check insulation resistance.
If the resistance value is 1M½ or less, insulation is defective.
(Example)
1
2
3
*Set the circuit breaker to OFF.
Remove power supply cords
from terminal plate in outdoor
unit.
• Check insulation resistance
of power supply cords.
OK
NO
NO
Insulation of
outdoor unit
is defective.
Rewire
Remove inter-unit power line
from terminal plate in outdoor
unit.
• Check insulation resistance
of outdoor unit.
OK
Remove inter-unit power line
from terminal plate in indoor
unit.
• Check insulation resistance
of indoor unit.
OK
Inter-unit power lines is
defective.
NO
Insulation of
indoor unit
is defective.
• Check insulation
resistance of
electrical parts
in outdoor unit.
• Check insulation
resistance of
electrical parts
in indoor unit.
Rewire
+
+
+
+
+
+
1
3
2
Circuit
breaker
Outdoor
unit
5 1
6 2
3
4
Indoor
unit
1
2
3
4
Power
supply
cords
Interunit
power line
L
N
Earth
+
+
+
+
+
+
+
+
1
3
2
Circuit
breaker
Indoor
unit
1
2
Power
supply
cords
Interunit
power line
L1
L2
L3
N
Earth
4
+
+
+
+
4
Outdoor
unit
5 1
6
7 2
4
3
8
4
3
18
