Technibel MCAV127C5VAB Technical Data & Service Manual page 23

B. Circuit breaker trips in several minutes after turning the air conditioner on.
There is a possibility of short circuit.
• Check capacity of circuit breaker.
Capacity of circuit breaker is
suitable.
Measure resistance of outdoor fan
•
motor winding.
• Measure resistance of compressor
motor winding.
7-2-2. Neither indoor nor outdoor unit runs.
Power is not supplied.
Check power supply.
•
Power is being supplied
to the outdoor unit.
7-2-3. Only outdoor unit does not run.
Check power relay in outdoor unit.
Measure coil resistance of power relay. (RA, RB)
NO
Replace with suitable
one (larger capacity).
Circuit breaker
is tripped.
NO
Power failure.
20
Reset breaker.
Wait for recovery
or contact power
company.