7-2. Air conditioner does not operate.
7-2-1. 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 2M
Ω
or less, insulation is defective (“NO”).
Measure insulation
resistance of electrical
parts in outdoor unit.
NO
NO
Set circuit breaker to OFF.
*
Measure insulation
resistance of electrical
parts in indoor unit.
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.
•
•
•
Insulation of
outdoor unit
is defective.
Insulation of
indoor unit
is defective.
4
2
1
4
2
1
3
4
2
1
4
2
1
3
2
1
Indoor
unit B
Indoor
unit A
Outdoor
unit
Circuit
breaker
Inter-unit wiring
Power
supply
Ground
Ground
Ground
1
1
2
19
