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11-2. Air conditioner does not operate.
11-2-1.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”).
B. Circuit breaker trips in several minutes after turning the air conditioner on.
●
There is a possibility of short circuit.
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.
Replace with suitable
one (larger capacity).
•
NO
Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable.
•
Measure resistance of compressor
motor winding. (CMA and CMB)
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