Technibel GRV79R5VAA Technical Data & Service Manual page 64

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.
10-2-2. Neither indoor nor outdoor unit runs.
A. Power is not supplied.
• Check power supply.
Power is being supplied to the
indoor unit.
B. Check "OPERATION selector" switch in the indoor unit.
• OPERATION selector switch is set
in ON position.
Set OPERATION selector switch
to ON.
NO
NO
YES
NO
Replace with suitable
one (larger capacity).
In case of Heating operation :
• Measure resistance of 4-way valve's
winding.
Circuit breaker
is tripped.
Power failure
Indoor PCB Ass'y is defective.
60
Reset breaker.
Wait for recovery
or contact power
company.