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9-2. Air conditioner does not operate.
9-2-1. Circuit breaker trips (or fuse blows).
A. When the circuit breaker is set to ON, it is tripped soon. (Resetting is not possible.)
There is a possibility of ground fault.
Check insulation resistance.
If resistance value is 2MΩ or less, insulation is defective ("NO").
WARNING
*
Set circuit breaker to OFF.
1 Remove both power supply wires
and inter-unit wires from terminal
plate in outdoor unit.
Measure insulation resistance
•
of outdoor unit.
2 Remove inter-unit wires from
terminal plate in indoor unit.
Measure insulation resistance
•
of indoor unit.
2
1
Indoor
Inter–unit
unit
wiring
1
2
3
4
5
6
7
Ground
NO
NO
1
Power
Outdoor
supply
unit
wiring
1
8
Circuit
2
9
breaker
4
5
6
7
Insulation of
outdoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in outdoor unit.
Insulation of
indoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in indoor unit.
45
Power
supply
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Troubleshooting
