Air Conditioner Does Not Operate - Technibel MCA451R Technical Data & Service Manual

8-2. Air conditioner does not operate.

8-2-1. 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 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
NO
outdoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in outdoor unit.
Insulation of
NO
indoor unit
is defective.
Measure insulation
•
resistance of electrical
parts in indoor unit.
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