Check
SiBE06-708_A
131
Service Diagnosis
5.1.7 Outdoor Fan System Check
Check No.09
DC motor
5.1.8 Power Supply Waveforms Check
Check No.10
Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
Check to see if the power supply waveform is a sine wave. (Fig.1)
Check to see if there is waveform disturbance near the zero cross. (sections circled in Fig.2)
5.1.9 Inverter Units Refrigerant System Check
Check No.11
(R7159)
YES
YES
NO
NO
Outdoor fan
system is
functioning.
Check the outdoor fan system.
Go to
Check No. 15
.
Outdoor fan running?
Fan motor
lead wire connector
disconnected?
Reconnect the connector.
Fig.1
Fig.2
Refrigerant system check
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (
U0
).
(R8259)
YES
NO
Place the thermistor.
Replace the refrigerant.
Is the
discharge
pipe thermistor
disconnected from the
holder?
