Air Conditioner Does Not Operate - Technibel MCAV180C5VAA Technical Data & Service Manual

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").
Power
supply
*
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.
L1
L2 Circuit
breaker
L3
N
1
Power
Outdoor
supply
unit
wiring
L1 1
L2
L3
N 2
4
Ground
NO
NO
40
1 2
Inter-unit
Indoor
wiring
unit
1
2
4
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.