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SM830078
12. SERVICE PROCEDURES
2) Air Conditioner does not Operate
11
11
1 Circuit breaker trips (or fuse blows).
(a) When the circuit breaker is set to ON, it is tripped soon.
• There is a possibility of ground fault.
• Check insulation resistance.
If resistance value is 1 MΩ or less, it is a defect of insulation.
1
2
3
(Example)
*Set the circuit breaker to OFF.
Remove power supply cords
from the terminal plate in
the outdoor unit.
• Check insulation resistance
of power supply cords.
OK
NO
NO Insulation of
outdoor unit
is defective.
Execute
rewiring.
Remove inter-unit power line
from the terminal plate in
the outdoor unit.
• Check insulation resistance
of outdoor unit.
OK
Remove inter-unit power line
from the terminal plate in
the indoor unit.
• Check insulation resistance
of indoor unit.
OK
Inter-unit power lines are
defective.
NO
Insulation of
indoor unit
is defective.
• Check insulation
resistance of
electrical parts
in the outdoor unit.
• Check insulation
resistance of
electrical parts
in the indoor unit.
Execute
rewiring.
1340_X_S
+
+
+
+
+
+
1 3
2
Circuit
breaker
Power
supply
cords
Inter-unit
power line
Outdoor
unit
Indoor
unit
Ground
+
+
4
1
2
G
L1
L2
G
4
1
2
G
4